Day: July 23, 2026

J Neurosurg 145:190–205, 2026

This study evaluates the clinical value of routine postoperative CT after stereotactic brain biopsy (SBB) by analyzing 753 procedures over 28 years to identify predictors of hemorrhage, frequency of radiographic bleeding, and consequences for patient management. The authors compare imaging findings with symptoms, interventions, and hematoma expansion to assess whether a selective, symptom-driven imaging strategy is safe.

Key results show that 42% of initial postoperative CTs detected blood—mostly small, clinically silent biopsy-site or tract bleeds—while only 5% of CTs altered management. Predictors of postoperative hemorrhage included intraoperative blood through the biopsy needle, lower platelet counts, preoperative intralesional hemorrhage, and early neurological symptoms, supporting selective rather than routine imaging

Objective Identify predictors of post–stereotactic brain biopsy (SBB) hemorrhage and assess whether selective, symptom-driven postoperative CT can safely replace routine CT.

Methods Retrospective review of 753 SBBs (1993–2021) with postoperative CT within 48 hours; recorded any hemorrhage, new/worsening neurological symptoms within 30 days (early vs delayed), and “clinically significant hemorrhage” (CT blood prompting a management change attributable to hemorrhage).

Hemorrhage frequency/location Blood appeared on first postoperative CT in 316/753 (42%) cases, predominantly at the biopsy site and/or along the trajectory (97% of bleeds); most were clinically silent at the time of the first CT.

Key predictors of blood on CT Independent associations included early postoperative symptoms (OR 3.82), intraoperative blood through the biopsy needle (OR 2.88), preoperative intralesional hemorrhage (OR 31.4), and platelet count >100–150 × 10⁹/L (OR 1.7); platelet count ≤100 × 10⁹/L showed ~4× higher risk but was not statistically significant.

Symptoms & interventions New/worsening neurological symptoms occurred in 161/753 (21%); altered mental status post-SBB correlated with blood on CT (69% vs 31%); 4 cases required intervention (2 hemorrhage evacuations, 2 ventriculostomies).

Predictive value of initial CT Positive predictive value for detecting a new/expanding hemorrhage was 17%, while negative predictive value for ruling out subsequent new hemorrhage was 98%; no new bleeding occurred beyond 48 hours postoperatively.

Management impact Postoperative CT altered management in 5% of cases, mainly in symptomatic patients rather than neurologically stable ones.

Conclusion/recommendation Routine postoperative CT after SBB may be unnecessary for all patients; selective imaging is recommended for bleeding diathesis, intraoperative bleeding, existing intralesional hemorrhage, and/or new or worsening neurological symptoms, potentially reducing cost and radiation without compromising safety.