Owen briefs you on what matters in this week's digest.
Think chief-resident chalk talk: what matters, what changes practice, and where to spend your reading time.
Endovascular / Vascular
Nomogram for predicting delayed intraparenchymal hemorrhage after pipeline embolization device treatment in patients with intracranial aneurysms: a multicenter, retrospective model development and validation study.
Research • Endovascular / Vascular • Journal of neurointerventional surgery • 2026-02-16
Consider using the four-factor nomogram (age, aneurysm size, platelet aggregation, overlapping devices) to stratify DIPH risk after PED and tailor monitoring accordingly.
Study snapshot
Design
Multicenter retrospective cohort study
Population
Patients with intracranial aneurysms treated with Pipeline Embolization Devices at three institutions (2018-2024)
Intervention
Pipeline Embolization Device treatment
Comparator
None (single-arm risk prediction study)
Primary outcome
Development and validation of nomogram for predicting delayed intraparenchymal hemorrhage
Why it matters
Delayed intraparenchymal hemorrhage (DIPH) after Pipeline Embolization Device (PED) treatment is a devastating but poorly predictable complication. This study provides the first validated nomogram incorporating four key predictors—age, aneurysm maximum diameter, ADP-induced platelet aggregation, and overlapping devices—to quantify individual patient risk. Clinicians could consider using this tool to identify high-risk patients for closer monitoring or modified antiplatelet regimens.
Practice change
May support using a nomogram to identify high-risk patients for closer post-procedural monitoring.
More context
Key details
- Multicenter retrospective study of 959 PED-treated aneurysm patients (685 training, 274 validation)
- DIPH incidence was 2.3% in training cohort
- Age (OR 2.063 per 10 years, p=0.005) and maximum diameter (OR 1.099, p=0.004) increased DIPH risk
- ADP-induced platelet aggregation (OR 0.896, p<0.001) was protective
- Overlapping devices carried highest risk (OR 7.226, p=0.007)
- Nomogram demonstrated good calibration and clinical utility on decision curve analysis
- Model may help identify high-risk patients for closer monitoring
High-yield
A nomogram using age, aneurysm size, platelet aggregation, and overlapping devices predicted DIPH after PED with AUCs of -, identifying patients at substantially increased risk.
Clinical context
Delayed intraparenchymal hemorrhage is a severe complication after pipeline embolization device deployment for intracranial aneurysms. Predictive models for this complication are lacking.
Limitations
Retrospective design limits causal inference and may introduce selection biasExternal validation in broader populations needed to confirm generalizability
Methodological critique
Retrospective design limits causal inference despite rigorous statistical modeling.
Teaching pearl
When planning PED treatment, remember that overlapping devices increase DIPH risk sevenfold—consider this when deciding between single versus multiple devices, especially in older patients with larger aneurysms.
Funding and COI
Not stated
New insights on the predictive value of hypoperfusion intensity ratio in thrombectomy: an updated systematic review and meta-analysis with multiple cut-offs.
Research • Endovascular / Vascular • Journal of neurointerventional surgery • 2026-02-16
Why it matters
Long-term safety and durability data inform device selection and follow-up after endovascular procedures.
Teaching pearl
When applying this evidence, confirm the primary endpoint definition and follow-up time in the full text before changing practice.
More context
High-yield
Systematic review and meta-analysis; pooled effect size in forest plots; heterogeneity and bias assessment.
Therapeutic applications of drug coated balloons in symptomatic intracranial arterial stenosis: systematic review and quantitative meta-analysis.
Research • Endovascular / Vascular • Journal of neurointerventional surgery • 2026-02-16
Consider drug-coated balloons for symptomatic ICAS patients with ≥70% stenosis to potentially reduce restenosis rates.
OConsider drug-coated balloons for symptomatic ICAS patients with ≥70% stenosis to potentially reduce restenosis rates, but remain vigilant for individual patient responses.
Study snapshot
Design
Systematic review and meta-analysis
Population
Patients with symptomatic intracranial atherosclerotic stenosis ≥70%
Intervention
Drug-coated balloons (DCBs)
Comparator
Conventional balloons and stents
Primary outcome
Restenosis rates
Why it matters
Previously, intracranial atherosclerotic stenosis (ICAS) was treated with stenting or conventional balloons, but restenosis and complications remained problematic. This meta-analysis adds evidence that drug-coated balloons (DCBs) significantly reduce restenosis rates compared to conventional balloons (OR=0.24) and stents (OR=0.20) without increasing perioperative adverse events. Clinicians could consider DCBs as a promising alternative for symptomatic ICAS patients with ≥70% stenosis, especially when restenosis is a concern.
Practice change
May support using drug-coated balloons as a preferred endovascular intervention for symptomatic ICAS to reduce restenosis.
More context
Key details
- Systematic review and meta-analysis of 22 studies (6 controlled, 16 single-arm) with 1308 patients.
- In single-arm studies, perioperative stroke and mortality rate was 5.75%.
- Follow-up stroke and TIA rate was 1.26%.
- DCBs significantly reduced restenosis vs. conventional balloons (p=0.003) and stents (p<0.001).
- Heterogeneity was moderate (I²=44% for restenosis).
- Studies included patients with symptomatic ICAS.
- Authors call for larger prospective studies to validate findings.
High-yield
Drug-coated balloons significantly reduce restenosis rates compared to conventional balloons (OR=0.24) and stents (OR=0.20) in symptomatic ICAS patients.
Clinical context
Intracranial atherosclerotic stenosis (ICAS) is a major cause of ischemic stroke. Endovascular treatments like stenting face challenges with restenosis and complications.
Limitations
Included studies had moderate heterogeneity (I² up to 44%), suggesting variability in patient populations or protocols.Most evidence comes from single-arm studies, limiting comparative strength.
Methodological critique
Moderate heterogeneity in pooled analyses suggests variability across included studies.
Teaching pearl
When considering endovascular options for symptomatic ICAS, remember that DCBs offer a drug-eluting advantage without a permanent implant—think of them as a 'leave nothing behind' strategy that may cut restenosis by over 75% compared to stents.
Funding and COI
Not stated
Flow diversion for posterior circulation intracranial aneurysms: a systematic review and meta-analysis.
Research • Endovascular / Vascular • Journal of neurointerventional surgery • 2026-02-16
Flow diversion can be considered for posterior circulation aneurysms with expected occlusion around , but avoid it for fusiform-dolichoectatic subtypes and counsel patients about the thromboembolic and mortality risks.
OFlow diversion can be a viable option for posterior circulation aneurysms, but clinicians must avoid its use in fusiform-dolichoectatic subtypes due to significantly lower occlusion rates and increased thromboembolic and mortality risks.
Study snapshot
Design
Systematic review and meta-analysis
Population
Patients with posterior circulation intracranial aneurysms treated with flow diverters
Intervention
Flow diverter implantation
Comparator
None (single-arm meta-analysis)
Primary outcome
Complete occlusion rate (Raymond-Roy and/or O'Kelly-Marotta scales)
Why it matters
Flow diverters (FDs) are well-established for carotid aneurysms, but their role in posterior circulation (PC) aneurysms has been less clear due to concerns about safety and efficacy. This meta-analysis provides pooled estimates of occlusion rates and complication rates for FD treatment of PC aneurysms across 42 studies and 1,698 patients. Clinicians should consider FD as a viable option for PC aneurysms but exercise caution with fusiform-dolichoectatic subtypes and be prepared for higher thromboembolic and mortality risks compared to carotid applications.
Practice change
May support considering flow diversion for selected posterior circulation aneurysms while avoiding fusiform-dolichoectatic subtypes due to poor occlusion rates.
More context
Key details
- Systematic review and meta-analysis of 42 studies
- 1,698 patients with 1,760 posterior circulation aneurysms
High-yield
Flow diversion for posterior circulation aneurysms achieves a pooled complete occlusion rate of but carries a thromboembolic event rate of and a mortality rate of , with fusiform-dolichoectatic subtypes showing substantially lower occlusion rates of .
Clinical context
Posterior circulation aneurysms are associated with a higher risk of rupture. Flow diverters are widely used for carotid intracranial aneurysms, but their role in PC aneurysms is less established.
Limitations
High heterogeneity across studies (I² values up to 76%) suggests variability in patient populations, devices, and outcome definitionsLack of individual patient data limits adjustment for confounding factors and detailed subgroup analyses
Methodological critique
High statistical heterogeneity across included studies limits the precision of pooled estimates.
Teaching pearl
When considering flow diversion for a posterior circulation aneurysm, remember that while overall occlusion rates are adequate, fusiform-dolichoectatic morphologies respond poorly—have a frank discussion with patients about the nearly 50% failure rate and higher complication profile in these challenging cases.
Funding and COI
Not stated
Comparison of flow diverter alone versus flow diverter with coiling for large and giant intracranial aneurysms: systematic review and meta-analysis of observational studies.
Research • Endovascular / Vascular • Journal of neurointerventional surgery • 2026-02-16
For large/giant saccular aneurysms, consider adjunctive coiling with flow diverters to potentially improve occlusion rates.
OFor large/giant saccular aneurysms, adding coils to a flow diverter likely improves occlusion rates, but the complication trade-off remains unclear.
Study snapshot
Design
Systematic review and meta-analysis of observational studies
Population
Patients with large and giant intracranial aneurysms
Intervention
Flow diverter with adjunctive coiling
Comparator
Flow diverter alone
Primary outcome
Complete aneurysm occlusion (Raymond-Roy Occlusion Classification)
Why it matters
Previously, the benefit-risk balance of adding coiling to flow diverters for large/giant intracranial aneurysms was unclear due to conflicting observational data. This meta-analysis provides Level 1 evidence that FD+coiling significantly improves complete occlusion rates in saccular aneurysms, though complication differences remain uncertain. For large/giant saccular aneurysms, surgeons could consider adjunctive coiling with flow diverters to potentially enhance occlusion, while recognizing that complication profiles require further investigation.
Practice change
May support considering adjunctive coiling with flow diverters for large/giant saccular aneurysms to improve occlusion rates.
More context
Key details
- Systematic review/meta-analysis of 15 studies with 1130 patients
- 557 patients in FD alone group vs 573 in FD+coiling group
High-yield
NR
Clinical context
Large and giant intracranial aneurysms pose treatment challenges. The benefit-risk balance of flow diverters alone versus with coiling remains unclear.
Limitations
Observational studies only - no randomized controlled trials includedHigh heterogeneity across included studies in patient selection and techniques
Methodological critique
Limited to observational studies with inherent selection bias and heterogeneity in techniques.
Teaching pearl
When planning FD for large saccular aneurysms, remember that adding coils may boost your occlusion odds by nearly 60%, but weigh this against the still-unclear complication trade-off - particularly for fusiform aneurysms where no benefit was seen.
Funding and COI
Not stated
Tumor / Skull Base
Congress of Neurological Surgeons Systematic Review and Evidence-Based Guidelines Update for the Role of Imaging in the Management of Patients With Vestibular Schwannomas.
Research • Tumor / Skull Base • Neurosurgery • 2025-06-05
Continue using individualized imaging protocols for vestibular schwannoma management, as evidence remains low-quality and does not support standardized changes.
OContinue individualized imaging protocols for vestibular schwannoma management, as current guidelines are based on low-quality evidence and do not support standardized changes.
Study snapshot
Design
Systematic review
Population
Patients with vestibular schwannomas
Intervention
Imaging protocols for management
Comparator
None
Primary outcome
Evidence-based recommendations for imaging use
Why it matters
Before this update, imaging protocols for vestibular schwannoma management were based on heterogeneous practices and low-quality evidence from the 2018 guidelines. This systematic review adds a comprehensive evaluation of recent literature (2015-2022), identifying 57 studies to update recommendations. Clinicians should continue using current imaging practices cautiously, as this confirms the need for higher-quality evidence rather than changing protocols.
Practice change
Confirms current practice, highlighting that imaging protocols should remain individualized due to low-quality evidence.
More context
Key details
- Systematic review updating 2018 CNS guidelines for imaging in vestibular schwannoma management.
- Covered literature from January 1, 2015, to May 20, 2022.
- Seven clinical questions were formulated; recommendations were updated for six.
- Most included studies provided level III evidence, with rare level II studies.
- Recommendations are level III, reflecting low certainty and quality.
- Highlights variability in treatment philosophies influencing local decision-making.
- Identifies key areas for future study, including advanced imaging techniques and head-to-head protocol comparisons.
High-yield
This systematic review found that most evidence for imaging in vestibular schwannoma management is level III, leading to level III recommendations due to low certainty and quality.
Clinical context
Imaging is critical for vestibular schwannoma management, but protocols are heterogeneous and based on historical practices or low-quality evidence. This updates 2018 guidelines.
Limitations
Most evidence is level III, limiting the strength of recommendations.Heterogeneity in disease and treatment philosophies may affect generalizability.
Methodological critique
Reliance on predominantly level III evidence limits the strength of the updated recommendations.
Teaching pearl
When ordering imaging for vestibular schwannoma, remember that current guidelines are based on low-quality evidence—so tailor protocols to individual patient factors and institutional expertise rather than relying on rigid standards.
Funding and COI
Not stated
Congress of Neurological Surgeons Systematic Review and Evidence-Based Guideline on Hearing Preservation Outcomes in Patients With Sporadic Vestibular Schwannoma: Update.
Research • Tumor / Skull Base • Neurosurgery • 2025-06-05
NR
OCounsel patients with vestibular schwannoma that hearing preservation rates decline significantly over 10 years across all treatment modalities, with fewer than half maintaining serviceable hearing.
Study snapshot
Design
Systematic review and clinical practice guideline
Population
Adults with sporadic vestibular schwannoma and documented serviceable hearing at diagnosis
Intervention
Observation, stereotactic radiation, or microsurgery
Comparator
None (descriptive review)
Primary outcome
Serviceable hearing preservation rates at 2, 5, and 10 years
Why it matters
Before, hearing preservation outcomes for vestibular schwannoma were based on older data with limited long-term follow-up. This systematic review adds updated pooled estimates showing serviceable hearing declines over time across all modalities: observation (47% at 10 years), radiosurgery (38% at 10 years), and microsurgery (32% at 10 years). Clinicians should now counsel patients that regardless of treatment choice, fewer than half maintain useful hearing by 10 years, with microsurgery and radiosurgery potentially accelerating decline compared to observation.
Practice change
Confirms current practice of counseling patients about declining hearing preservation over time regardless of treatment choice.
More context
Key details
- Update to 2018 CNS Guideline on hearing preservation in sporadic vestibular schwannoma.
- Systematic review of studies through May 2022.
- Pooled estimated rates of serviceable hearing preservation for observation, radiosurgery, and microsurgery.
High-yield
NR
Clinical context
Given the increasing prevalence and shifting disease demographic of vestibular schwannoma toward smaller tumors in people with less advanced symptoms, increasing emphasis has been placed on functional hearing preservation.
Limitations
Pooled estimates from heterogeneous studies with varying methodologies.Limited high-quality comparative data on treatment modalities.
Methodological critique
Pooled estimates from observational studies with inherent selection biases.
Teaching pearl
When counseling vestibular schwannoma patients about hearing preservation, emphasize the sobering 10-year numbers: even with observation, only 47% keep serviceable hearing, and interventions may accelerate loss.
Funding and COI
Not stated
Outcomes After Stereotactic Radiosurgery for Intracranial Hemangioblastoma in Von Hippel-Lindau Disease and Sporadic Cases: An International Multicenter Study.
Research • Tumor / Skull Base • Neurosurgery • 2025-06-19
SRS provides effective tumor control for both VHL-associated and sporadic hemangioblastomas with favorable safety profile, particularly for solid tumors.
Study snapshot
Design
International multicenter retrospective cohort study
Population
Patients with intracranial hemangioblastomas (VHL-associated and sporadic) treated with stereotactic radiosurgery
Intervention
Stereotactic radiosurgery for hemangioblastoma
Comparator
None (single-arm outcomes study)
Primary outcome
Local tumor control and SRS-related complications
Why it matters
Stereotactic radiosurgery (SRS) outcomes for hemangioblastomas have been described in single-center series with limited comparative data between von Hippel-Lindau (VHL) and sporadic cases. This multicenter study provides contemporary evidence that SRS achieves tumor control in approximately 85% of VHL-associated and 76% of sporadic tumors with low complication rates. Clinicians can offer SRS as an effective treatment option for both VHL and sporadic hemangioblastomas, particularly for solid tumors.
Practice change
Confirms current practice of using SRS as an effective treatment option for both VHL-associated and sporadic hemangioblastomas.
More context
Key details
- International multicenter retrospective study of 104 VHL and 89 sporadic patients
- 433 VHL-associated and 137 sporadic tumors treated with SRS
High-yield
SRS achieved tumor control in 85% of VHL-associated and of sporadic hemangioblastomas with radiation-induced changes in only - of cases.
Clinical context
Hemangioblastomas are rare benign vascular tumors that may occur sporadically or in association with von Hippel-Lindau disease. Limited data exist regarding factors affecting outcomes after stereotactic radiosurgery.
Limitations
Retrospective design across multiple centers introduces potential heterogeneity in treatment protocolsLack of standardized follow-up imaging protocols may affect progression detection
Methodological critique
Retrospective multicenter design may introduce treatment heterogeneity despite large sample size.
Teaching pearl
When considering SRS for hemangioblastomas, remember that cystic tumors in sporadic cases are less likely to be controlled—consider alternative approaches or closer surveillance for these lesions.
Funding and COI
Not stated
The 35-Year Evolution of Stereotactic Radiosurgery for Meningiomas.
Research • Tumor / Skull Base • Neurosurgery • 2025-08-22
Why it matters
Guideline and evidence synthesis can standardize diagnostic workup and counseling for skull base tumor patients.
Teaching pearl
When applying this evidence, confirm the primary endpoint definition and follow-up time in the full text before changing practice.
More context
High-yield
Journal article (design NR); resection extent and recurrence; neurological morbidity.
Congress of Neurological Surgeons Systematic Review and Evidence-Based Guideline on Surgical Resection for the Treatment of Patients With Vestibular Schwannomas: Update.
Research • Tumor / Skull Base • Neurosurgery • 2025-06-05
Continue offering hearing preservation surgery for vestibular schwannoma patients with good preoperative hearing and counsel those needing microsurgery after radiosurgery about increased risks of subtotal resection and facial nerve dysfunction.
OContinue to offer hearing preservation surgery for vestibular schwannoma patients with good preoperative hearing, but ensure thorough counseling regarding the heightened risks of subtotal resection and facial nerve dysfunction for those requiring microsurgery post-radiosurgery.
Study snapshot
Design
Systematic review for guideline development
Population
Patients with sporadic vestibular schwannomas
Intervention
Surgical resection
Comparator
Various surgical approaches and non-surgical management
Primary outcome
Evidence-based recommendations for surgical intervention
Why it matters
The 2018 CNS guidelines provided evidence-based recommendations for surgical resection of vestibular schwannomas, but new literature has emerged since then. This systematic review updates those guidelines by analyzing studies published from 2015 to 2022. The findings confirm current practice: hearing preservation surgery remains an option for patients with good preoperative hearing, and patients needing microsurgical resection after radiosurgery should be counseled about increased risks of subtotal resection and facial nerve dysfunction.
Practice change
Confirms current practice
More context
Key details
- Systematic review of literature on surgical intervention for vestibular schwannomas
- Search of PubMed and MEDLINE databases
- Manuscripts meeting inclusion criteria analyzed for guideline recommendations
- Updates 2018 CNS Guideline on surgical intervention for sporadic vestibular schwannomas
- Addresses specific clinical questions with evidence-based recommendations
- Acknowledges insufficient data for some questions
High-yield
This guideline update confirms that hearing preservation surgery through middle fossa or retrosigmoid approaches may be considered for vestibular schwannoma patients with good preoperative hearing, and microsurgical resection after stereotactic radiosurgery carries increased risks of subtotal resection and facial nerve dysfunction.
Clinical context
Surgical intervention remains an important option in the management of vestibular schwannomas. Development of a systematic approach to choose the most appropriate route for this intervention, based on existing published evidence, is an important goal.
Limitations
The review acknowledges insufficient data were present to create answers for some clinical questionsAs a guideline update, it relies on previously established methodology and may not include all recent studies beyond the search cutoff
Methodological critique
The guideline update process followed established systematic review methodology but acknowledges data gaps for some clinical questions.
Teaching pearl
When discussing surgical options for vestibular schwannoma with a patient who has good preoperative hearing, remember that middle fossa and retrosigmoid approaches for hearing preservation remain valid alternatives to observation—but be prepared to explain that evidence hasn't changed much since 2018.
Funding and COI
Not stated
Mapping the Functional Boundaries of the Speech Articulation Network Using Positive and Negative Direct Electrical Stimulation With Resting-State Functional MRI.
Research • Tumor / Skull Base • Neurosurgery • 2025-07-25
Incorporate both positive and negative DES data when planning glioma resections near speech areas to better define functional boundaries.
OWhen mapping speech areas, document both positive and negative stimulation sites to define functional boundaries more precisely, as negative points help delineate non-eloquent tissue.
Study snapshot
Design
Observational cohort study
Population
25 patients with brain gliomas (17 HGGs/9 LGGs) undergoing awake surgery
Intervention
Intraoperative DES mapping of speech articulation with rs-fMRI connectivity analysis
Comparator
None
Primary outcome
Mapping of speech articulation network boundaries using DES-positive and DES-negative points
Why it matters
Traditional speech articulation mapping has relied on positive DES sites, leaving functional boundaries poorly defined. This study adds negative DES mapping to delineate SAN boundaries with unprecedented accuracy, identifying a 41% threshold that balances sensitivity (~80%) and specificity (~80%). Surgeons could consider incorporating both positive and negative DES data when planning glioma resections near speech areas to better define functional boundaries.
Practice change
Could consider incorporating both positive and negative DES data for more precise speech network boundary definition.
More context
Key details
- 25 glioma patients (17 HGGs/9 LGGs) undergoing awake surgery
- 32 DES-positive and 42 DES-negative points analyzed after quality control
- Seed-based rs-fMRI connectivity analysis from DES sites
- DES-positive SAN involved bilateral rolandic operculum, inferior frontal gyrus, superior temporal gyrus
- DES-negative network distinct from anticorrelated SAN
- Sensitivity and specificity profiles crossed around 41% threshold
- Bi-hemispheric distribution observed regardless of language lateralization
High-yield
NR
Clinical context
Speech articulation network mapping traditionally uses positive DES sites. The functional boundaries remain poorly defined.
Limitations
Small sample size (n=25) limits generalizabilitySingle-center study with potential institutional bias in DES technique
Methodological critique
Small sample size and single-center design limit statistical power and generalizability.
Teaching pearl
When mapping speech areas, don't just note where stimulation causes arrest - also document where it doesn't, as these negative points help define the actual functional boundaries more precisely than positive points alone.
Funding and COI
Not stated
Spine
Full-endoscopic lumbar spine discectomy: are we finally there? A meta-analysis of its effectiveness against nonmicroscopic discectomy, microdiscectomy and tubular discectomy.
Research • Spine • The spine journal : official journal of the North American Spine Society • 2025-02-28
FELD is a reasonable alternative to traditional discectomy techniques, offering similar safety with potential advantages in early recovery for selected patients.
Study snapshot
Design
Systematic review and meta-analysis
Population
Adult patients (≥18 years) with symptomatic lumbar disc herniation without concurrent lumbar spinal stenosis
Intervention
Full-endoscopic lumbar discectomy
Comparator
Microdiscectomy, tubular discectomy, or open nonmicroscopic discectomy
Primary outcome
Comparative effectiveness across adverse effects, operative parameters, hospital stay, and clinical indices
Why it matters
The comparative effectiveness of full-endoscopic lumbar discectomy (FELD) versus traditional techniques has been unclear despite technological advancements. This meta-analysis suggests FELD offers advantages in short-term pain relief and faster mobilization while maintaining comparable safety profiles. Surgeons could consider FELD as a viable option for selected patients, particularly when early recovery is prioritized, though more robust trials are needed.
Practice change
Could consider FELD as a viable option for selected patients when early recovery is prioritized, given comparable safety profiles.
More context
Key details
- Meta-analysis of studies comparing FELD with microdiscectomy, tubular discectomy, or open discectomy
- Included adult patients with symptomatic lumbar disc herniation without concurrent stenosis
- Studies published between 2013-2024 from multiple databases
- Quality assessment using Cochrane risk-of-bias tool and Newcastle-Ottawa Scale
- FELD showed advantages in operative parameters and clinical indices
- Limited number of prospective trials included
- Authors call for more well-designed prospective randomized trials
- Need for comprehensive cost analyses including societal costs
High-yield
FELD provides comparable recurrence, reoperation, and complication rates to traditional techniques while offering advantages in short-term pain relief and faster patient mobilization.
Clinical context
Full-endoscopic lumbar discectomy has gained attention as a minimally invasive alternative to conventional techniques, but it remains unclear whether it offers definitive advantages over traditional methods.
Limitations
Substantial heterogeneity across studies limits definitive conclusionsLimited number of prospective randomized trials included in analysis
Methodological critique
Substantial heterogeneity across included studies limits the strength of pooled conclusions.
Teaching pearl
When discussing surgical options for lumbar disc herniation, remember that FELD offers comparable safety to traditional techniques but may get patients mobilized faster—consider this for patients where rapid return to activity is a priority.
Funding and COI
Not stated
Complications in Minimally Invasive Spine Surgery (2013-2024): A Proportional Meta-Analysis -Uniportal Endoscopic Spine Surgery (UESS).
Research • Spine • Spine • 2025-10-06
Counsel patients that lumbar UESS carries approximately 10% complication risk, with dural tears and nerve injuries being most common.
OUESS carries a ~10% complication risk, so focus your technical refinement on preventing dural tears and nerve injuries.
Study snapshot
Design
Systematic review and proportional meta-analysis
Population
Adult patients undergoing lumbar uniportal endoscopic spine surgery
Intervention
Lumbar UESS for various spinal pathologies
Comparator
None
Primary outcome
Overall and specific complication rates
Why it matters
UESS complication rates have been reported variably from 0-30%, creating uncertainty about its safety profile. This meta-analysis establishes a pooled overall complication rate of 9.79% with dural tears (3.75%) and nerve palsy (2.69%) as most common. Surgeons can now counsel patients with more precise complication estimates and focus technical refinement on preventing dural tears and nerve injuries.
Practice change
Confirms current practice with more precise complication estimates for patient counseling and technical focus.
More context
Key details
- Systematic review/proportional meta-analysis of 21 studies (1258 patients)
- Follow-up periods ranged from 6 to 26.5 months
High-yield
NR
Clinical context
UESS offers reduced tissue damage and faster recovery but has a steep learning curve with complication rates reported between 0% and 30%.
Limitations
High heterogeneity in overall complication rates (I²=65.5%)Predominantly retrospective studies from limited geographic regions
Methodological critique
High heterogeneity across studies suggests variable patient selection, surgical techniques, and complication reporting.
Teaching pearl
When starting UESS, anticipate that nearly 1 in 10 cases will have a complication, with dural tears being your most likely challenge - factor this into your consent discussions and focus your technical refinement on dural protection and nerve visualization.
Funding and COI
Not stated
Effectiveness and Cost Burden of School Screening for Adolescent Idiopathic Scoliosis: A Systematic Review and Meta-Analysis.
Research • Spine • Spine • 2025-11-12
Support well-designed, multistep school screening programs for AIS to enable early bracing intervention, reduce fusion rates by 73%, and achieve cost savings.
OWhen evaluating a positive school screening for scoliosis, remember that the low positive predictive value means many referrals are false positives—so use a multistep protocol with clinical exam and radiography only when indicated to avoid unnecessary radiation.
Study snapshot
Design
Systematic review and meta-analysis
Population
Asymptomatic pupils aged 10 to 16 screened at school for adolescent idiopathic scoliosis
Intervention
School-based screening programs
Comparator
Usual care (no screening)
Primary outcome
Prevalence, diagnostic performance, clinical impact, and cost burden
Why it matters
Previously, school screening for adolescent idiopathic scoliosis was controversial due to concerns about false positives, radiation, and cost. This meta-analysis adds pooled data from 34 studies covering 2.8 million pupils, showing screening detects curves at milder stages (mean Cobb 28° vs. 40° in usual care) with 73% lower fusion odds and potential net savings. Clinicians should advocate for well-designed, multistep screening programs to optimize early detection and reduce surgical burden.
Practice change
May support implementing or advocating for structured school screening programs to reduce progression and surgical rates in AIS.
More context
Key details
- Systematic review and meta-analysis of 34 studies covering 2.8 million pupils aged 10-16.
- Screening tests had high negative predictive value (approaching 100%) and variable positive predictive value (4% to 80%).
- Numbers needed to screen to start bracing ranged from 448 to 2234.
- Costs were $0.47 to $55 per pupil, with most economic models predicting net savings.
- Screen-detected adolescents had significantly lower Cobb angles and fusion rates.
- Highlights need for standardized programs to minimize unnecessary referrals and radiation.
- Authors note wide variations in prevalence, methods, and cost frameworks.
High-yield
NR
Clinical context
Routine screening for adolescent idiopathic scoliosis aims to detect curves before skeletal maturity for bracing, but controversy exists over false positives, radiation, and cost.
Limitations
High heterogeneity in screening methods and cost frameworks across studies.Wide ranges in test performance (e.g., PPV 4% to 80%) indicate variability in program effectiveness.
Methodological critique
High heterogeneity across studies in screening methods and economic evaluations limits generalizability.
Teaching pearl
When evaluating a positive school screening for scoliosis, remember that the low PPV means many referrals are false positives—so use a multistep protocol with clinical exam and radiography only when indicated to avoid unnecessary radiation.
Funding and COI
Not stated
Complications in Minimally Invasive Spine Surgery (2013-2024): Lumbar Spine-Tubular Minimally Invasive Techniques: A Proportional Meta-Analysis.
Research • Spine • Spine • 2025-10-29
Use the pooled complication rates from this meta-analysis ( overall, dural tears, nerve injuries) to counsel patients undergoing tubular minimally invasive lumbar spine surgery, while recognizing that individual risk varies with patient factors and surgeon experience.
OUse the pooled complication rates from this meta-analysis to inform patient discussions about tubular minimally invasive lumbar spine surgery, while emphasizing that individual risks may vary based on patient-specific factors and surgeon expertise.
Study snapshot
Design
Systematic review and proportional meta-analysis
Population
Adult patients undergoing tubular minimally invasive spine surgery for lumbar pathologies
Intervention
Tubular minimally invasive spine surgery
Comparator
None (single-arm meta-analysis)
Primary outcome
Complication rates (overall and specific)
Why it matters
Tubular minimally invasive spine surgery (MISS) is popular for lumbar pathologies due to reduced tissue disruption, but complication rates have been inconsistently reported across studies. This proportional meta-analysis provides pooled estimates of specific complication rates from 75 studies involving approximately 12,600 patients over the past decade. Clinicians can use these rates for more accurate patient counseling and surgical planning, recognizing that overall complication rates are generally low but vary by complication type.
Practice change
Could consider using these pooled complication rates for more accurate patient counseling and surgical planning for tubular MISS procedures.
More context
Key details
- Systematic review and proportional meta-analysis
- Studies from January 2013 to March 2024
- Included studies with ≥10 adult patients undergoing tubular lumbar MISS
- Random-effects model used for pooling complication rates
- Study quality assessed with Cochrane Risk of Bias Tool and Newcastle-Ottawa Scale
High-yield
Tubular minimally invasive lumbar spine surgery has an overall complication rate of , with dural tears occurring in of cases, nerve injuries in , and revision surgeries in .
Clinical context
Tubular MISS is widely used for lumbar pathologies due to its reduced tissue disruption and faster recovery compared with open surgery. However, reported complication rates vary, and pooled estimates for specific complications remain limited.
Limitations
High statistical heterogeneity across studies (I² up to 93%) suggests substantial variability in patient populations, surgical techniques, and outcome definitionsAs a proportional meta-analysis of single-arm studies, it lacks comparative data against open surgery or other minimally invasive techniques
Methodological critique
High statistical heterogeneity across included studies limits the precision of pooled estimates.
Teaching pearl
When consenting a patient for tubular MISS, quote the 10% overall complication rate but break it down: emphasize that dural tears are the most common at 4%, while serious nerve injuries and infections are around 1%—these numbers help set realistic expectations while highlighting the procedure's generally favorable safety profile.
Funding and COI
Not stated
Functional
Spanish translation, adaptation, and validation of the Epilepsy Surgery Satisfaction Questionnaire-19.
Research • Functional • Epilepsia • 2025-10-11
NR
OIncorporate the validated ESP-ESSQ_19 questionnaire into routine follow-up for Spanish-speaking epilepsy surgery patients to assess quality of life and patient satisfaction beyond seizure control.
Study snapshot
Design
Multicenter prospective cohort study
Population
Adult patients from Spanish-speaking countries who underwent epilepsy surgery at least 1 year prior
Intervention
Spanish translation, adaptation, and validation of the Epilepsy Surgery Satisfaction Questionnaire-19 (ESP-ESSQ_19)
Comparator
None (validation study)
Primary outcome
Psychometric properties of ESP-ESSQ_19 including internal consistency and test-retest reliability
Why it matters
Previously, patient satisfaction after epilepsy surgery was often overlooked in favor of seizure control metrics alone. This study provides a validated Spanish-language tool (ESP-ESSQ_19) with adequate psychometric properties for systematically assessing patient-reported outcomes. Clinicians could consider incorporating this questionnaire into routine follow-up to better capture the holistic impact of surgery beyond seizure freedom.
Practice change
Could consider incorporating the validated ESP-ESSQ_19 questionnaire into routine follow-up for Spanish-speaking epilepsy surgery patients to assess patient-reported outcomes.
More context
Key details
- Prospective multicenter study across five Spanish-speaking countries
- Adult patients who underwent epilepsy surgery ≥1 year prior
- Temporal lobe epilepsy was most common (77.8%)
- Structural etiology predominated (95.2%)
- 68.7% of patients were seizure-free for ≥1 year at inclusion
- 94 patients completed both baseline and follow-up questionnaires
- Median time since surgery was 3 years (IQR 1-7)
High-yield
NR
Clinical context
The effectiveness of epilepsy surgery is often focused exclusively on seizure control. The ESSQ-19 is a reliable tool for assessing patient satisfaction after epilepsy surgery.
Limitations
Single-language validation limits generalizability to non-Spanish speaking populationsNo comparison to other satisfaction measures beyond correlation with validated questionnaires
Methodological critique
The study followed rigorous translation/back-translation methodology but lacks comparison to other satisfaction measures beyond correlation with validated questionnaires.
Teaching pearl
When following epilepsy surgery patients, remember that seizure freedom doesn't equal patient satisfaction—use validated tools like ESP-ESSQ_19 to systematically assess quality of life domains that matter to your Spanish-speaking patients.
Funding and COI
Not stated
Asleep Deep Brain Stimulation for Essential Tremor.
Research • Functional • Stereotactic and functional neurosurgery • 2025-09-24
For essential tremor patients with significant procedural anxiety, asleep MRI-guided DBS targeting VIM offers excellent tremor control with minimal targeting error.
OFor anxious ET patients, asleep MRI-guided VIM DBS offers comparable tremor control to awake surgery with submillimeter accuracy, making it a viable alternative to avoid the stress of intraoperative testing.
Study snapshot
Design
Retrospective chart review
Population
Essential tremor patients undergoing DBS under general anesthesia using MRI-guided ClearPoint technique
Intervention
Interventional MRI-guided DBS lead placement under general anesthesia
Comparator
None (single-arm retrospective study)
Primary outcome
Clinical outcomes including medication reduction, FTM tremor rating scale, and QUEST quality of life questionnaire
Why it matters
Traditional DBS for essential tremor requires awake surgery with intraoperative testing, which can be challenging for patients with anxiety or medical comorbidities. This retrospective study demonstrates that asleep MRI-guided DBS targeting the VIM nucleus yields excellent tremor control (69.2% stopped or reduced medication) with minimal radial error (0.43 mm). For appropriately selected ET patients with anxiety about awake surgery, consider discussing asleep MRI-guided DBS as a viable alternative that maintains efficacy.
Practice change
May support offering asleep MRI-guided DBS as an alternative for ET patients with significant anxiety about traditional awake surgery.
More context
Key details
- Retrospective review of 113 ET patients (175 leads) at a community health system
- Interventional MRI-guided ClearPoint technique under general anesthesia
- Targeting ventral intermediate nucleus (VIM) for essential tremor
- Only 2 leads required more than one pass
- Quality of Life in Essential Tremor Questionnaire improved from 47.1 to 29.4
- Mean age 68.1 ± 9.4 years, 44.2% female
- Procedure performed between 2016-2021 by single surgeon
High-yield
Asleep MRI-guided DBS for essential tremor achieved 69.2% medication reduction/cessation with submillimeter targeting accuracy (0.43 mm radial error).
Clinical context
DBS was FDA-approved for essential tremor in 1997. Interventional MRI-guided DBS lead placement is an emerging technique for ET patients.
Limitations
Retrospective design without control group for comparison to awake DBSSingle-surgeon, single-institution experience limits generalizability
Methodological critique
Retrospective design without control group limits causal inference about comparative effectiveness.
Teaching pearl
When counseling anxious ET patients about DBS, remember that asleep MRI-guided targeting can achieve submillimeter accuracy comparable to awake techniques—don't let anxiety alone exclude someone from potentially life-changing tremor control.
Funding and COI
Not stated
Optimizing responsive neurostimulation targeting based on interictal high-frequency oscillations and phase-amplitude coupling.
Research • Functional • Epilepsia • 2025-10-17
Consider using interictal HFO and PAC biomarker analysis to guide RNS electrode placement for potentially better outcomes.
OConsider incorporating interictal high-frequency oscillations and phase-amplitude coupling analyses for RNS electrode placement to potentially enhance seizure outcomes.
Study snapshot
Design
Retrospective cohort study
Population
Patients with drug-resistant epilepsy who underwent iEEG monitoring and subsequent RNS implantation
Intervention
RNS electrode placement guided by interictal HFOs and delta-HFO PAC distribution
Comparator
Conventional seizure onset zone (SOZ)-based targeting
Primary outcome
≥50% seizure reduction at last follow-up
Why it matters
Previously, RNS electrode placement relied primarily on seizure onset zone (SOZ) localization, which doesn't always correlate with optimal stimulation targets. This study suggests that interictal high-frequency oscillations (HFOs) and delta-HFO phase-amplitude coupling (PAC) can serve as spatial biomarkers to guide RNS targeting, with weighted median distances within 20-30 mm from stimulation sites to peak biomarker locations predicting better outcomes. Clinicians could consider incorporating these open-source biomarker analyses when planning RNS electrode placement, especially in cases where SOZ targeting is ambiguous.
Practice change
May support incorporating interictal HFO and PAC biomarker analysis using open-source tools when planning RNS electrode placement, particularly when SOZ targeting is ambiguous.
More context
Key details
- Retrospective study of 18 patients with drug-resistant epilepsy who underwent iEEG monitoring and subsequent RNS implantation
- Inclusion required ≥60 min of slow-wave sleep iEEG data and ≥6 months post-RNS follow-up
High-yield
Weighted median distances from RNS electrodes to peak HFO and PAC sites were significantly shorter in the good outcome group (p<.0001), suggesting better targeting.
Clinical context
Responsive neurostimulation (RNS) is used for drug-resistant epilepsy, but optimal electrode targeting remains challenging. Interictal biomarkers like high-frequency oscillations (HFOs) and phase-amplitude coupling (PAC) may offer improved localization.
Limitations
Retrospective design with small sample size (n=18) limits generalizabilityExclusion of patients with simultaneous/resective surgery or exclusively thalamic electrodes may introduce selection bias
Methodological critique
Small sample size and retrospective design limit the strength of conclusions despite statistically significant findings.
Teaching pearl
When reviewing iEEG for RNS planning, don't just map the SOZ—run the open-source HFO and PAC analyses on slow-wave sleep segments; placing electrodes within 20-30 mm of those biomarker peaks might give your patient a better shot at meaningful seizure reduction.
Funding and COI
Not stated
Targeting interictal low-entropy zones during epilepsy surgery predicts successful outcomes in pediatric drug-resistant epilepsy.
Research • Functional • Epilepsia • 2025-09-20
Why it matters
Functional neurosurgery and epilepsy surgery evidence can inform patient selection and counseling about cognitive outcomes.
Teaching pearl
When applying this evidence, confirm the primary endpoint definition and follow-up time in the full text before changing practice.
More context
High-yield
Journal article (design NR), N=59; seizure freedom or symptom control; cognitive and functional side effects.
General Neurosurgery
Decompressive craniectomy versus best medical treatment alone for spontaneous intracerebral hemorrhage: A systematic review and meta-analysis.
Research • General Neurosurgery • International journal of stroke : official journal of the International Stroke Society • 2025-08-05
For select patients with spontaneous intracerebral hemorrhage, decompressive craniectomy may reduce mortality and improve functional outcomes compared to medical management alone.
ODecompressive craniectomy may be beneficial for select patients with spontaneous intracerebral hemorrhage by reducing mortality and improving functional outcomes, but clinicians should temper expectations regarding independence due to the variability in outcomes.
Study snapshot
Design
Systematic review and meta-analysis
Population
Patients with spontaneous intracerebral hemorrhage
Intervention
Decompressive craniectomy
Comparator
Best medical treatment alone
Primary outcome
Modified Rankin Scale (mRS), mortality at multiple time points, length of hospital stay
Why it matters
Previously, the role of decompressive craniectomy (DC) in spontaneous intracerebral hemorrhage (sICH) was uncertain, with limited high-quality evidence comparing it to best medical treatment (BMT) alone. This meta-analysis of 743 patients demonstrates that DC is associated with reduced mortality and improved functional outcomes compared to BMT alone. Neurosurgeons should consider DC as a viable option for select sICH patients, particularly those at high risk of mortality, while awaiting more definitive randomized trials.
Practice change
May support considering decompressive craniectomy more readily for spontaneous intracerebral hemorrhage patients, particularly those at high mortality risk.
More context
Key details
- Systematic review and meta-analysis of 8 studies comparing DC to BMT alone for sICH
- DC associated with reduced mortality at 30 days (OR=0.36), 90 days (OR=0.35), and last follow-up (OR=0.33)
- DC improved rates of good neurological function (mRS 0-4) with OR=2.29
- BMT alone associated with poor neurological function (mRS 5-6) with OR=0.44
High-yield
Decompressive craniectomy for spontaneous intracerebral hemorrhage reduces mortality (OR=0.33 at last follow-up) and improves functional outcomes (OR=2.29 for mRS 0-) compared to best medical treatment alone.
Clinical context
Managing spontaneous intracerebral hemorrhage remains challenging despite advances. Recent studies suggest decompressive craniectomy may offer benefits over conservative treatment in certain cases.
Limitations
Heterogeneity in included studies (both randomized and observational designs) may introduce selection biasHigh statistical heterogeneity for some outcomes (I² up to 92.9% for length of stay)
Methodological critique
The inclusion of both randomized and observational studies introduces potential selection bias despite statistical adjustments.
Teaching pearl
When considering DC for sICH, focus on mortality reduction and functional improvement rather than expecting excellent outcomes (mRS 0-2), as the data shows clear benefit for preventing poor outcomes but less certainty for achieving independence.
Funding and COI
Not stated
Hydrocephalus Caused by Methylmalonic Acidemia: Clinical Characteristics, Optimal Timing of Surgical Intervention and Health-Related Quality of Life.
Research • General Neurosurgery • Neurosurgery • 2025-06-20
NR
OIn managing hydrocephalus due to methylmalonic acidemia, prioritize optimizing metabolic control for at least one month and avoid shunt placement before 4.5 months of age to reduce revision rates and improve quality of life.
Study snapshot
Design
Retrospective cohort study
Population
Patients with methylmalonic acidemia (MMA)-related hydrocephalus
Intervention
Ventriculoperitoneal shunt (VPS) surgery
Comparator
Medical management without surgery
Primary outcome
Optimal timing of surgical intervention and health-related quality of life
Why it matters
Hydrocephalus is a known but poorly characterized complication of methylmalonic acidemia (MMA), with limited evidence on surgical management timing and outcomes. This retrospective study identifies MMA as the fourth most common cause of pediatric hydrocephalus and provides concrete cutoff values for surgical decision-making: Evans index >0.45 indicates need for VPS, while delaying surgery beyond 1 month of drug treatment and 4.5 months of age may reduce revision rates. For patients requiring VPS, consider delaying surgery when possible to optimize metabolic control and reduce complications, as earlier intervention correlated with higher revision rates and worse quality of life.
Practice change
Could consider delaying VPS surgery beyond 4.5 months of age and after at least 1 month of optimized metabolic treatment when managing MMA-related hydrocephalus, based on reduced revision rates and better quality of life outcomes.
More context
Key details
- Retrospective study of 77 patients with MMA-related hydrocephalus followed for 2-10 years
- MMA was fourth most common hydrocephalus etiology among 1671 cases
- 66 patients (85.7%) required VPS surgery; 11 (14.3%) responded to medical treatment alone
- Evans index cutoff of 0.45 differentiated VPS vs non-VPS groups (p<.001)
- 24.7% required revision surgery; shorter drug treatment (<1 month) and younger surgical age (<4.5 months) predicted revisions
- Revision group had lower Evans index and worse quality of life scores
- Non-VPS group had superior PedsQL scores across all domains compared to VPS group
High-yield
NR
Clinical context
Hydrocephalus is a rare complication of methylmalonic acidemia (MMA), an inherited metabolic disorder. Optimal timing of surgical intervention remains unclear.
Limitations
Retrospective single-center design limits generalizability5 patients excluded due to incomplete data and 7 lost to follow-up may introduce bias
Methodological critique
Retrospective design with potential selection bias due to exclusions and loss to follow-up.
Teaching pearl
When managing MMA-related hydrocephalus, don't rush to shunt—get that Evans index and optimize metabolic control for at least a month; surgery before 4.5 months of age nearly doubles the revision risk and significantly impacts quality of life.
Funding and COI
Not stated
Long-term Efficacy of Repetitive Transcranial Magnetic Stimulation at Motor Cortex for Mild Traumatic Brain Injury-Related Headaches.
Research • General Neurosurgery • Neuromodulation : journal of the International Neuromodulation Society • 2025-10-19
Consider referring patients with persistent MTBI-related headaches for a trial of ten-session rTMS targeting the left motor cortex, as it may reduce headache burden and improve cognitive function for up to three months.
Study snapshot
Design
Double-blind, randomized controlled trial
Population
Patients with mild traumatic brain injury-related headaches
Intervention
Ten sessions of active repetitive transcranial magnetic stimulation (10 Hz) at left motor cortex
Comparator
Sham rTMS
Primary outcome
Reduction in persistent headache frequency and debilitating headache duration
Why it matters
Persistent headaches after mild traumatic brain injury (MTBI) are common and debilitating, with limited effective treatments previously available. This RCT demonstrates that repetitive transcranial magnetic stimulation (rTMS) at the left motor cortex significantly reduces headache frequency and duration, with improvements in cognitive and mood symptoms. Clinicians could consider rTMS as a non-invasive option for MTBI-related headaches, focusing on a protocol of ten sessions to achieve sustained benefits over several months.
Practice change
Could consider rTMS as a non-invasive treatment option for patients with MTBI-related headaches who have not responded to conventional therapies.
More context
Key details
- Double-blind, randomized controlled trial in patients with MTBI-related headaches.
- Active rTMS (10 Hz) delivered to left motor cortex under MRI-based neuronavigation.
- Assessments included headache, cognitive, and mood measures up to three months post-treatment.
- Mixed effect model showed significant reduction in headache frequency and duration.
- Improvements observed in daily activity interference, concentration, attention, word processing speed, and recall accuracy.
- Treatment may cause mild transient headache exacerbation without maintenance intervention.
- Clinical trial registered as NCT03314584.
High-yield
Active rTMS significantly reduces persistent headache frequency and debilitating headache duration up to three months post-treatment, with p<0.001, offering a non-pharmacologic option for MTBI-related headaches.
Clinical context
Persistent headaches are common and debilitating in mild traumatic brain injury populations, often associated with neuropsychologic dysfunction. This trial assessed rTMS for reducing headache symptoms and impairments.
Limitations
Sample size and specific population details (e.g., N, demographics) are not extracted, limiting generalizability.Lack of long-term follow-up beyond three months to assess durability of effects without maintenance.
Methodological critique
The double-blind, randomized design strengthens internal validity, but unreported sample size limits assessment of power and generalizability.
Teaching pearl
For residents managing MTBI headaches, remember that ten sessions of left motor cortex rTMS can cut headache frequency and boost cognition—think of it as a neuromodulatory 'reset' for post-concussive circuits.
Funding and COI
Not stated
Interhospital Variation in Operative Intervention for Firearm-Related Penetrating Traumatic Brain Injury and Associations With Inpatient Mortality.
Research • General Neurosurgery • Neurosurgery • 2025-07-17
For firearm pTBI patients, especially those with unreactive pupils, consider transfer to centers with greater surgical experience when logistically feasible.
OFor patients with firearm pTBI, especially those with unreactive pupils, consider transfer to a high-volume surgical center when feasible, as it is associated with significantly lower mortality.
Study snapshot
Design
Retrospective cohort study
Population
Adult patients with firearm-related penetrating traumatic brain injury
Intervention
Treatment at hospitals with different cranial surgery tendencies
Comparator
Hospitals stratified into quartiles based on surgical tendency (Q1 lowest to Q4 highest)
Primary outcome
Inpatient mortality
Why it matters
Firearm-related penetrating TBI has high mortality, but optimal surgical management remains controversial with limited evidence. This retrospective cohort study found substantial interhospital variation in cranial surgery rates (0%-71%) and showed that treatment at high-surgery hospitals (quartile 4) was associated with 39% lower odds of mortality compared to low-surgery hospitals. For patients with unreactive pupils—who showed amplified survival benefit at high-surgery hospitals—consider transferring to centers with greater surgical experience when feasible.
Practice change
Could consider transferring firearm pTBI patients, particularly those with unreactive pupils, to centers with higher surgical experience when transfer is feasible.
More context
Key details
- Retrospective cohort study using ACS TQIP database
- 4,895 adult patients with firearm-related penetrating TBI
- 309 hospitals included, median patient age 31 years
- Median cranial surgery rate 21% across hospitals
- Hospitals stratified into quartiles by surgical tendency
- Propensity score matching used to compare quartiles
- Effect modification by pupillary reactivity tested
High-yield
NR
Clinical context
Firearm-related penetrating traumatic brain injury carries a high mortality risk and grim prognosis. This study aimed to quantify interhospital variation in operative intervention.
Limitations
Retrospective design cannot establish causality between surgical tendency and survivalLack of granular clinical data on individual patient decision-making
Methodological critique
Retrospective design using administrative data limits clinical granularity and causal inference.
Teaching pearl
When a GSW to the head rolls in, remember that centers with higher surgical rates show better survival—especially for those fixed pupils. This doesn't mean operate on everyone, but suggests experience matters.
Funding and COI
Not stated
Brain Imaging Findings Show Efficacy of Fetal Endoscopic Third Ventriculostomy as Prenatal Treatment for Induced Congenital Hydrocephalus in Fetal Lambs.
Research • General Neurosurgery • Neurosurgery • 2025-08-22
Fetal ETV shows promise in animal models for reducing ventricular dilatation in congenital hydrocephalus, but human application requires further investigation.
OFetal endoscopic third ventriculostomy shows potential in lamb models for congenital hydrocephalus, but clinicians should approach human applications with caution due to significant anatomical and physiological differences.
Study snapshot
Design
Preclinical animal study
Population
Fetal lambs with BioGlue-induced obstructive hydrocephalus
Intervention
Fetal endoscopic third ventriculostomy (ETV)
Comparator
Hydrocephalus without treatment and normal controls
Primary outcome
Lateral ventricular diameter reduction and brain mantle thickness improvement
Why it matters
Fetal endoscopic third ventriculostomy (ETV) has been proposed as a prenatal treatment for congenital hydrocephalus, but evidence for its efficacy has been limited. This preclinical study suggests that fetal ETV can reduce ventricular dilatation and improve brain mantle thickness in a lamb model of induced hydrocephalus. Clinicians should view these findings as preliminary evidence supporting further investigation of fetal ETV in human trials.
Practice change
May support further investigation of fetal ETV in human trials for congenital hydrocephalus, but does not change current clinical practice.
More context
Key details
- Animal study using fetal lamb model of BioGlue-induced obstructive hydrocephalus
High-yield
NR
Clinical context
Fetal interventions for congenital hydrocephalus have evolved since the 1980s, with fetal imaging improvements enhancing diagnostic accuracy. Ventricular shunting in newborns improves outcomes in obstructive hydrocephalus.
Limitations
Preclinical animal model with uncertain translation to human fetal physiologySmall sample sizes in treatment subgroups (n=4-10 per subgroup)
Methodological critique
The study uses a well-characterized animal model but has small subgroup sample sizes and uncertain translational relevance to human fetal surgery.
Teaching pearl
When considering fetal interventions for hydrocephalus, remember that animal models like this lamb study provide proof-of-concept but require cautious interpretation—human fetal anatomy, CSF dynamics, and surgical risks differ substantially.
Funding and COI
Not stated
Basic Science
Metabolic Profiling Defines Glioblastoma Subtypes with Distinct Prognoses and Therapeutic Vulnerabilities.
Research • Basic Science • Neuro-oncology • 2026-01-02
Why it matters
Mechanistic work may identify targets that later translate into neurosurgical oncology or neuroregeneration therapies.
Teaching pearl
When applying this evidence, confirm the primary endpoint definition and follow-up time in the full text before changing practice.
More context
High-yield
Basic science (preclinical); mechanistic endpoints in methods; not applicable (preclinical).
Long-term administration of the mutant IDH inhibitor DS-1001b suppresses the growth of IDH1-mutant glioma in vitro and in mouse xenograft models and alters epigenetic profiles.
Research • Basic Science • Acta neuropathologica • 2026-02-12
NR
OIn IDH-mutant glioma cases, consider that mutant IDH inhibitors like DS-1001b target the oncometabolite 2-HG and may reverse epigenetic dysregulation—monitor for emerging clinical trial data.
Study snapshot
Design
Preclinical basic science study
Population
IDH1 R132H-mutant glioma cell lines and mouse xenograft models
Intervention
DS-1001b (mutant IDH1 inhibitor) administration
Comparator
Vehicle control
Primary outcome
Survival in xenograft models, 2-HG reduction, epigenetic changes
Why it matters
IDH1 mutations drive glioma through D-2-HG production and epigenetic dysregulation, but effective targeted therapies remain limited. This preclinical study shows DS-1001b, a brain-penetrant mutant IDH1 inhibitor, reduces 2-HG, prolongs survival in xenografts, and reverses epigenetic changes. While not yet clinical, these findings support further development of DS-1001b as a potential therapy for IDH-mutant gliomas.
Practice change
Confirms current preclinical research direction for IDH-mutant glioma therapies but does not change clinical practice.
More context
Key details
- Preclinical study of DS-1001b, a brain-penetrant oral IDH1 inhibitor
- Targets IDH1 R132H and R132C mutations
- Tested in IDH1 R132H-mutant glioma cell lines and xenograft models
- Reduced 2-HG levels in vitro and in vivo
- Prolonged survival in A1074 and BT142 intracranial xenografts
- Partially reversed genome-wide DNA hypermethylation with prolonged exposure
- H3K4me3 modulation linked to differential gene expression
- Metabolomic changes included reduced asparagine levels
- Affected apoptosis, necrosis, cell cycle, and migration pathways
High-yield
NR
Clinical context
IDH1 mutations produce D-2-HG, driving glioma through epigenetic dysregulation. This study investigated the antitumor effects of DS-1001b, a mutant IDH1 inhibitor.
Limitations
Preclinical mouse models may not fully recapitulate human glioma biologyShort-term effects and optimal dosing schedules require further investigation
Methodological critique
Preclinical models limit direct translation to human patients without clinical trial validation.
Teaching pearl
In IDH-mutant glioma cases, consider that mutant IDH inhibitors like DS-1001b target the oncometabolite 2-HG and may reverse epigenetic dysregulation—monitor for emerging clinical trial data.
Funding and COI
Not stated
SMARCAL1 is a targetable synthetic lethal therapeutic vulnerability in ATRX-deficient gliomas that use Alternative Lengthening of Telomeres.
Research • Basic Science • Neuro-oncology • 2026-01-10
Why it matters
Mechanistic work may identify targets that later translate into neurosurgical oncology or neuroregeneration therapies.
Teaching pearl
When applying this evidence, confirm the primary endpoint definition and follow-up time in the full text before changing practice.
More context
High-yield
Basic science (preclinical); mechanistic endpoints in methods; not applicable (preclinical).
Trials to Know
Pilot Study of IT Topotecan and Maintenance Chemotherapy for HR-EBTs in Children < 6 Years, Post Consolidation
Trial • Trials to Know • ClinicalTrials.gov • 2026-03-01
Why it matters
This recruiting trial may offer eligible patients access to novel interventions.
Achieving a Better Outcome Through Limiting the Glioblastoma Clinical Target Volume
Trial • Trials to Know • ClinicalTrials.gov • 2026-03-01
Why it matters
This recruiting trial may offer eligible patients access to novel interventions.
Testing the Addition of an Anti-Cancer Drug, Triapine, to the Usual Radiation Therapy for Recurrent Glioblastoma or Astrocytoma
Trial • Trials to Know • ClinicalTrials.gov • 2026-03-01
Why it matters
This recruiting trial may offer eligible patients access to novel interventions.
Feasibility of Intraoperative Tracing of Meningioma Using [Cu64]DOTATATE
Trial • Trials to Know • ClinicalTrials.gov • 2026-03-01
Why it matters
This recruiting trial may offer eligible patients access to novel interventions.
A Study of the Drugs Selumetinib vs. Carboplatin and Vincristine in Patients With Low-Grade Glioma
Trial • Trials to Know • ClinicalTrials.gov • 2026-03-01
Why it matters
This recruiting trial may offer eligible patients access to novel interventions.
A Phase I/II Study of IVONESCIMAB in Recurrent Glioblastoma
Trial • Trials to Know • ClinicalTrials.gov • 2026-03-01
Why it matters
This recruiting trial may offer eligible patients access to novel interventions.
From the Preprint Wire
Machine Learning with Cerebrovascular Morphology Predicts Post-Thrombectomy Complications
Preprint • From the Preprint Wire • medrxiv • 2026-02-17
Why it matters
This preprint presents a machine-learning approach that integrates quantitative cerebrovascular morphology with clinical data to predict complications like neurological deterioration, hemorrhage, and malignant edema after endovascular thrombectomy (EVT) for acute ischemic stroke. If validated, this could help neurosurgeons identify high-risk patients earlier for targeted monitoring and intervention, potentially improving outcomes. However, as an unreviewed preprint, these findings require confirmation through peer review and external validation.
Whole Exome Sequencing Reveals Novel Gene Associations in Suspected Monogenic Cerebral Small Vessel Disease
Preprint • From the Preprint Wire • medrxiv • 2026-02-16
Why it matters
This preprint identifies novel genetic associations in cerebral small vessel disease (CSVD), which is highly relevant to neurosurgeons as it accounts for approximately 20% of strokes and nearly half of vascular dementia cases. If validated, these findings could improve diagnostic yield and potentially guide management for patients with unexplained CSVD, though it is crucial to note this is an unreviewed preprint requiring confirmation.
More context
Key details
- Analysis focused on patients negative for pathogenic variants in seven well-characterized CSVD genes (NOTCH3, HTRA1, COL4A1, COL4A2, TREX1, GLA, FOXC1).
- Identified 18 candidate disease-causing variants across nine CSVD-associated genes and significant burdens in ABCC6, MYH11, and NOTCH1.
- Found novel associations for seven genes (COL7A1, HMCN1, LAMA1, MMP9, TENM4, TNC, TTN) with monogenic CSVD, highlighting potential new diagnostic targets.
Interictal Mini-Seizures as a Continuum of Epileptic Network Dynamics
Preprint • From the Preprint Wire • medrxiv • 2026-02-16
Why it matters
This preprint proposes a novel framework where 'mini-seizures'—brief interictal hypersynchronous events—represent a continuum with overt seizures, driven by the same epileptogenic network. For neurosurgeons, this could refine presurgical mapping by identifying key network hubs from interictal data alone, potentially improving resection planning and outcomes in epilepsy surgery. However, as an unreviewed preprint, these findings require validation before clinical application.