# Neurosurgical resection of multiple brain metastases: outcomes, complications, and survival rates in a retrospective analysis

## TL;DR

This study examines the outcomes of surgically removing multiple brain metastases, finding that most patients experience clinical stabilization or improvement, though complications and extracranial disease affect survival.

## Contribution

The study provides novel insights into the outcomes and risk factors associated with microsurgical resection of multiple brain metastases.

## Key findings

- Microsurgical resection of multiple brain metastases leads to clinical stabilization or functional improvement in most patients.
- Persistent neurological deficits and progressive extracranial disease significantly reduce overall survival.
- Eloquent localization and infratentorial craniotomy are significant predictors of postoperative complications.

## Abstract

This study investigates the outcomes of microsurgical resection of multiple brain metastasis (BMs).

This retrospective, monocentric analysis included clinical data from all consecutive BM patients, who underwent simultaneous resection of ≥ 2 BMs between January 2018 and May 2023. Postoperative neurological and functional outcomes, along with perioperative complications, as well as survival data were evaluated.

A total of 47 patients, with a median age of 61 years (IQR 48–69), underwent 73 craniotomies (median 2; range 1–3) for resection of 104 BMs. Among patients, 80.8% presented with symptomatic BMs, causing focal neurological deficits in 53% of cases. Gross total resection was achieved in 87.2% of BMs. Karnofsky Performance Scale (KPS) scores improved in 42.6% of patients, remained unchanged in 46.8%, and worsened in 10.6% after surgery. Perioperative complications were observed in 29.8% of cases, with transient complications occurring in 19.2% and permanent deficits in 10.6%. The 30-days mortality rate was 2.1%. Logistic regression identified eloquent localization (p = 0.036) and infratentorial craniotomy (p = 0.018) as significant predictors of postoperative complications. Concerning overall prognosis, patients with permanent neurological deficits post-surgery (HR 11.34, p = 0.007) or progressive extracranial disease (HR: 4.649; p = 0.006) exhibited inferior survival.

Microsurgical resection of multiple BMs leads to clinical stabilization or functional improvement in most patients. Although transient complications do not affect overall survival, the presence of persistent neurological deficits (> 3 months post-surgery) and progressive extracranial disease negatively impact overall survival. This highlights the importance of careful patient selection for resection of multiple BMs.

The online version contains supplementary material available at 10.1007/s11060-024-04744-w.