Executive Summary
This week's digest highlights: Flow diversion is a safe and effective treatment for selected distal cerebral aneurysms, especially in the anterior cerebral artery territory. In managing multiple pituitary adenomas, evaluate all lesions with endocrine correlation to avoid diagnostic pitfalls and enhance surgical strategies. Assessing self-image is crucial in adult spinal deformity patients, as it significantly...
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
Flow diversion for distal cerebral aneurysms: a systematic review and meta-analysis.
Research • Endovascular / Vascular • Journal of neurointerventional surgery • 2026-03-13
Flow diversion appears to be a safe and effective option for carefully selected distal cerebral aneurysms, particularly in the anterior cerebral artery territory.
OFlow diversion can be a safe and effective treatment for selected distal cerebral aneurysms, especially in the anterior cerebral artery territory, but clinicians should remain cautious of the 5.5% risk of covered branch occlusion.
Study snapshot
Design
Systematic review and meta-analysis
Population
Patients with distal cerebral aneurysms (located at or beyond ACA A2, MCA M2, and PCA P2 segments)
Intervention
Flow diverter treatment
Comparator
None (single-arm synthesis)
Primary outcome
Adequate and complete aneurysm occlusion, procedure-related morbidity and mortality
Why it matters
Flow diverters are increasingly used off-label for distal cerebral aneurysms, but comprehensive safety and efficacy data have been limited. This meta-analysis synthesizes current evidence, showing high occlusion rates and low complication rates for this application. Clinicians could consider flow diversion as a viable option for carefully selected distal cerebral aneurysms, particularly in the anterior cerebral artery territory.
Practice change
Could consider flow diversion as a viable option for carefully selected distal cerebral aneurysms, particularly in the anterior cerebral artery territory.
More context
Key details
- Systematic review and meta-analysis of 18 studies with 441 patients (70% women)
- 445 distal cerebral aneurysms, mostly unruptured (93.7%) and in ACA territory (78.4%)
- Retreatment rate was 1.6% (95% CI, 0.2 to 3)
High-yield
Flow diversion for distal cerebral aneurysms achieved adequate occlusion in and complete occlusion in of cases, with procedure-related morbidity of 1.5% and mortality of .
Clinical context
Flow diverters are increasingly used off-label for distal cerebral aneurysms, but data on their safety and efficacy remain limited. This systematic review and meta-analysis synthesizes current evidence on FD treatment for DCAs.
Limitations
Included studies were observational with potential selection biasLimited long-term follow-up data on durability and delayed complications
Methodological critique
Limited to observational studies with potential selection bias.
Teaching pearl
When considering flow diversion for distal aneurysms, remember that ACA territory lesions dominate the literature and show promising results, but be particularly vigilant for covered branch occlusion which occurred in about 5.5% of cases.
Funding and COI
Not stated
Tumor / Skull Base
Decoy Lesion in Functional Multiple Pituitary Adenomas: Literature Review and Illustrative Cases on Diagnostic Pitfalls and Surgical Strategies.
Research • Tumor / Skull Base • World neurosurgery • 2026-02-04
In multiple pituitary adenomas with functioning components, systematically evaluate all lesions with endocrine correlation rather than focusing solely on the most radiologically prominent mass.
OIn cases of multiple pituitary adenomas, prioritize a thorough evaluation of all lesions for endocrine activity, as the true source of hormonal excess may be smaller and less prominent than the dominant radiological mass, which could lead to missed diagnoses and suboptimal surgical outcomes.
Study snapshot
Design
Systematic review
Population
Patients with multiple pituitary adenomas, particularly those with functioning components
Intervention
Surgical identification and treatment strategy
Comparator
None (descriptive review)
Primary outcome
Identification of responsibility versus decoy lesions and surgical outcomes
Why it matters
Multiple pituitary adenomas with functioning components present diagnostic challenges when radiologically dominant lesions don't correspond to hormonally active ones. This review identifies that responsibility lesions are often less conspicuous on MRI and smaller than decoy lesions. Surgeons should systematically evaluate all lesions in multiple pituitary adenoma cases, not just the most radiologically prominent ones, to avoid missing the true source of hormonal excess.
Practice change
Surgeons should systematically evaluate all lesions in multiple pituitary adenoma cases with endocrine correlation, not just the most radiologically prominent ones.
More context
Key details
- Systematic review of English-language case reports (2000-2024) plus 2 illustrative cases
- 35 patients included in the review
- Lesions classified as responsibility or decoy based on endocrine outcomes, radiology, and surgical findings
- Responsibility lesions are less conspicuous on preoperative MRI and usually smaller than decoy lesions
- Missed identification of responsibility lesion reported in substantial proportion of cases
- Focus on diagnostic pitfalls and surgical strategies for multiple pituitary adenomas
High-yield
In multiple pituitary adenomas with functioning components, 43% of patients failed to achieve biochemical remission after initial surgery, often due to missed identification of the true responsibility lesion.
Clinical context
Multiple pituitary adenomas, particularly those involving functioning adenoma, represent a special subtype that pose dual challenges in diagnosis and treatment. The coexistence of hormonally active and silent lesions may result in diagnostic pitfalls.
Limitations
Based on case reports with inherent publication biasSmall sample size limits generalizability
Methodological critique
Based on case reports with publication bias.
Teaching pearl
In multiple pituitary adenoma cases, don't let the biggest MRI lesion distract you - the hormonally active lesion is often smaller and less conspicuous, so systematically evaluate all lesions with endocrine correlation.
Funding and COI
Not stated
Spine
Self-Image in Adult Spinal Deformity: The Critical Link Between Baseline Disability, Treatment Choice, and Surgical Satisfaction.
Research • Spine • Spine • 2025-08-04
Formally assess self-image when counseling adult spinal deformity patients, as it strongly influences both surgical decision-making and postoperative satisfaction.
OClinicians should incorporate formal assessments of self-image into the counseling process for adult spinal deformity patients, as it significantly influences surgical decision-making and postoperative satisfaction, despite the moderate evidence quality.
Study snapshot
Design
Prospective, multicenter analysis
Population
Adult spinal deformity patients
Intervention
Operative versus nonoperative treatment
Comparator
Nonoperative treatment
Primary outcome
Factors correlating with treatment choice and treatment satisfaction
Why it matters
Adult spinal deformity outcomes have traditionally focused on pain and physical function, with limited data on self-image's role in treatment decisions and satisfaction. This study demonstrates that self-image is the strongest predictor of patients choosing surgery and correlates most with postoperative satisfaction. Clinicians should formally assess self-image when counseling ASD patients, as it significantly influences both treatment choice and ultimate satisfaction.
Practice change
May support formally assessing self-image when counseling adult spinal deformity patients, as it strongly influences both surgical decision-making and postoperative satisfaction.
More context
Key details
- Prospective, multicenter analysis of ASD patients (2009-2020)
- Minimum 2-year follow-up for treatment satisfaction assessment
- Operatively treated patients had worse baseline PROMs than nonoperatively treated (p<0.0001)
- Gradient-boosted decision trees, factor analysis, and logistic regression used
- Nonoperative patients demonstrated deterioration of self-image and reported poor treatment satisfaction
- Self-image improvement correlated most with post-treatment satisfaction in operative group
- Data from physical exam, demographics, spinal alignment, and PROMs (SRS-22r, ODI, SF36, NRS)
High-yield
Self-image had the greatest correlation with patients choosing operative treatment (odds ratio=) and demonstrated the greatest health domain improvement postoperatively, correlating most with treatment satisfaction.
Clinical context
ASD outcomes traditionally focus upon pain and physical function. Self-image is an important outcome measure for pediatric spine deformity. Little data exists regarding the impact self-image has upon ASD treatment choice and outcomes.
Limitations
Observational design limits causal inferencePotential selection bias in treatment assignment
Methodological critique
Observational design limits causal inference about treatment effects.
Teaching pearl
When counseling ASD patients, ask specifically about self-image concerns - it's not just about pain and function, but how patients see themselves that most strongly predicts who will choose surgery and be satisfied afterward.
Funding and COI
Not stated
Functional
Fusion of Supervised Feature Selection and Unsupervised Clustering for Multinuclei Classification of MER Signals in DBS for Parkinson's Disease.
Research • Functional • IEEE transactions on neural networks and learning systems • 2026-03-27
Consider incorporating this hybrid machine learning framework as an adjunct tool to improve efficiency and accuracy when identifying STN, Zi, and SN during DBS electrode placement.
OWhile the hybrid machine learning framework shows promise in improving intraoperative identification of key nuclei during DBS for Parkinson's disease, its low evidence quality necessitates cautious integration into clinical practice until further validation is achieved.
Study snapshot
Design
Journal article (design not specified)
Population
Not specified in source
Intervention
Three-class classification strategy for MER signals integrating supervised feature selection with unsupervised clustering
Comparator
Expert labeling
Primary outcome
Classification accuracy for distinguishing zona incerta, STN, and substantia nigra
Why it matters
Accurate intraoperative identification of key nuclei during DBS surgery for Parkinson's disease has traditionally relied on expert annotations and binary classification, limiting real-time recognition of complex neuroanatomy. This study introduces a hybrid supervised-unsupervised approach that achieves high classification accuracy for three nuclei while substantially reducing manual annotation burden. Neurosurgeons could consider this computational framework as a potential tool to enhance intraoperative targeting efficiency during DBS procedures.
Practice change
Could consider as an adjunct computational tool to enhance intraoperative targeting efficiency during DBS procedures.
More context
Key details
- Proposes three-class classification of MER signals to distinguish zona incerta, STN, and substantia nigra
- Integrates random forest algorithm for feature selection with fuzzy c-means clustering for preliminary classification
- Low-confidence samples undergo manual review, creating an efficient label-generation mechanism
- Overall classification accuracy of 92.71% closely matches expert labeling accuracy
- Method reduces manual annotation costs while maintaining high accuracy
- Well-suited for real-time applications like intraoperative target localization
- Shows strong potential for clinical translation in DBS procedures
High-yield
A hybrid machine learning approach combining supervised feature selection with unsupervised clustering achieved 92.71% accuracy in classifying three key nuclei from MER signals during DBS surgery, with only about 10% of samples requiring manual verification.
Clinical context
Accurate intraoperative identification of key nuclei is critical for DBS efficacy in Parkinson's disease. Current approaches depend on expert annotations and are typically limited to binary classification.
Limitations
Study design not clearly specified in source material, limiting assessment of methodological rigorNo information provided about sample size, patient demographics, or validation cohort characteristics
Methodological critique
Study design not clearly specified, limiting assessment of methodological rigor.
Teaching pearl
When reviewing MER signals during DBS, remember that computational approaches can now distinguish between three key nuclei with high accuracy, potentially reducing the cognitive load on the surgeon during real-time targeting.
Funding and COI
Not stated
General Neurosurgery
Comparative analysis of analgesic mechanisms in craniotomy pediatric patients: a scoping review.
Research • General Neurosurgery • Child's nervous system : ChNS : official journal of the International Society for Pediatric Neurosurgery • 2026-03-23
Implement multimodal analgesic regimens for pediatric craniotomy patients, combining opioids with non-opioid agents while carefully monitoring for neurological side effects.
OIn pediatric craniotomy patients, employing a multimodal analgesic strategy that combines opioids with non-opioid agents is advisable, but clinicians must remain vigilant for potential neurological side effects due to the limited evidence on optimal pain management protocols.
Study snapshot
Design
Scoping review following PRISMA-ScR guidelines
Population
Pediatric patients undergoing craniotomies
Intervention
Various postoperative analgesic approaches including opioids, NSAIDs, acetaminophen, and sedatives
Comparator
Different analgesic regimens compared across studies
Primary outcome
Synthesis of evidence on analgesic efficacy and safety in pediatric craniotomy patients
Why it matters
Postoperative pain management in pediatric craniotomy patients has lacked consolidated evidence and clear guidelines, with concerns about opioid side effects interfering with neurological assessments. This scoping review synthesizes available evidence on analgesic approaches and provides recommendations for multimodal pain management strategies. Clinicians should consider adopting multimodal analgesic approaches tailored to pediatric patients while monitoring for neurological side effects.
Practice change
Confirms current practice of considering multimodal analgesic approaches for pediatric craniotomy patients.
More context
Key details
- Scoping review following PRISMA-ScR guidelines identified 709 articles, with 24 meeting inclusion criteria
- Post-craniotomy pain in children is generally superficial and somatic, involving scalp, pericranial muscles, and dura
- Multimodal approaches targeting different pain mechanisms show efficacy
- Opioids were used in 70.7% of patients, primarily morphine and codeine
- NSAIDs/acetaminophen combinations and sedatives were also reported
- Effective analgesia can reduce stress responses and chronic pain risk
- Review provides evidence-based recommendations for analgesic selection and utilization
High-yield
A scoping review of studies found that multimodal analgesic approaches are effective for pediatric craniotomy pain, with opioids remaining commonly used but requiring careful monitoring due to potential interference with neurological examinations.
Clinical context
Managing postoperative pain in pediatric craniotomy patients remains challenging with limited consolidated evidence and guidelines. Opioids have limitations due to potential adverse effects and interference with neurological examinations.
Limitations
Scoping review methodology provides synthesis but not quantitative meta-analysis of treatment effectsLimited data available on postoperative outcomes and complications in included studies
Methodological critique
Scoping review provides synthesis but not quantitative treatment effect analysis.
Teaching pearl
When managing post-craniotomy pain in children, remember that a multimodal approach combining different analgesic classes may provide better pain control with fewer side effects than high-dose opioids alone.
Funding and COI
Not stated
Basic Science
Detrimental Effect of Early Clazosentan Administration on Neurogenic Pulmonary Edema Following Subarachnoid Hemorrhage and Safety of Its Delayed Administration: Laboratory Investigation.
Research • Basic Science • World neurosurgery • 2025-12-13
Delay clazosentan initiation in SAH patients with active neurogenic pulmonary edema until pulmonary status stabilizes, as early administration may worsen lung injury.
OIn patients with subarachnoid hemorrhage and active neurogenic pulmonary edema, delay clazosentan administration until pulmonary status stabilizes, as early use may worsen lung injury based on preclinical findings.
Study snapshot
Design
Laboratory investigation (preclinical)
Population
Male mice with endovascular perforation-induced subarachnoid hemorrhage
Intervention
Clazosentan administration at different time points after SAH
Comparator
Saline vehicle
Primary outcome
Lung water content and histopathological lung injury scores
Why it matters
Clazosentan is used to prevent cerebral vasospasm after aneurysmal SAH, but its safety in patients with neurogenic pulmonary edema has been uncertain due to pulmonary edema being a known side effect. This preclinical study suggests that early clazosentan administration exacerbates SAH-induced NPE, while delayed administration appears safe. Neurosurgeons should consider delaying clazosentan initiation in SAH patients with active NPE until pulmonary edema shows improvement.
Practice change
May support delaying clazosentan initiation in SAH patients with active neurogenic pulmonary edema until pulmonary edema shows improvement.
More context
Key details
- Preclinical study using mouse endovascular perforation SAH model
High-yield
In a mouse model of SAH, early clazosentan administration significantly worsened neurogenic pulmonary edema, while delayed administration showed no detrimental effects on lung injury.
Clinical context
Clazosentan is used to prevent cerebral vasospasm following aneurysmal SAH, but its safety in patients with neurogenic pulmonary edema is unclear due to pulmonary edema being a known side effect.
Limitations
Preclinical mouse model may not fully translate to human pathophysiologySmall sample sizes typical of laboratory investigations limit statistical power
Methodological critique
Preclinical mouse model may not fully translate to human pathophysiology.
Teaching pearl
When considering clazosentan for vasospasm prophylaxis in SAH patients with pulmonary edema, remember that timing matters—early administration may exacerbate lung injury, while delayed treatment appears safer.
Funding and COI
Not stated
Trials to Know
The Effect and Safety of Combined Anti-platelet Treatment in Acute Ischemic Stroke Due to Large Artery Atherosclerosis
Trial • Trials to Know • ClinicalTrials.gov • 2026-03-27
Why it matters
This recruiting trial may offer eligible patients access to novel interventions.
A Study to Learn About the Study Medicine Called PF-07799544 as Monotherapy or in Combination in People With Advanced Solid Tumors
Trial • Trials to Know • ClinicalTrials.gov • 2026-03-27
Why it matters
This recruiting trial may offer eligible patients access to novel interventions.
From the Preprint Wire
Bariatric Surgery History Increases Portal Hypertension Risk in Alcohol-Associated Hepatitis
Preprint • From the Preprint Wire • medrxiv • 2026-03-14
Why it matters
This preprint suggests patients with a history of bariatric surgery who develop alcohol-associated hepatitis face a significantly higher risk of portal hypertension complications, which is crucial for neurosurgeons managing conditions like variceal bleeding or hepatic encephalopathy. As an unreviewed study, it highlights potential long-term hepatologic risks that could inform preoperative counseling and multidisciplinary care for neurosurgical patients with this history. However, neurosurgeons should interpret these findings cautiously until peer-reviewed validation.
More context
Key details
- Study used TriNetX US Collaborative Network with 772 matched patients per cohort after propensity score matching on 44 variables.
- Found significantly higher risk of portal hypertension events (HR 1.519, p=0.003) but no significant differences in liver transplantation or all-cause mortality.
- Authors recommend enhanced postoperative counseling and liver surveillance for bariatric surgery patients, which could be relevant in neurosurgical preoperative assessments.
Spatial Immune Landscape of Mismatch Repair Deficient Endometrial Cancer
Preprint • From the Preprint Wire • medrxiv • 2026-03-14
Why it matters
This preprint explores the tumor microenvironment in dMMR endometrial cancer, which is relevant to neurosurgeons as these tumors can metastasize to the brain and may require neurosurgical intervention. Understanding immune cell spatial organization could help predict recurrence and response to immunotherapy, potentially guiding treatment decisions for metastatic cases. However, as a preprint, this work has not undergone peer review and should be interpreted cautiously.
More context
Key details
- Used multiplex immunofluorescence imaging with a 36-antibody panel on 16 dMMR endometrial tumors to analyze immune cell composition and spatial relationships.
- Non-recurrent tumors (n=10) had higher intratumoral CD8 T-cells, tumor cell enrichment around CD8+ T cells, and PD-1Low CD4 T-cell proportions.
- Recurrent tumors (n=6) showed higher CD4+ T cell proportions and distinct macrophage spatial patterns, with ICI responders having more PD-1+Ki67+ CD8+ T cells and dispersed macrophages co-localized with PD-1+ CD8 T cells.