Repeat microsurgery for recurrent vestibular schwannoma achieves gross total resection but increases facial nerve deterioration risk to 43%

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Journal of neuro-oncology Published May 30, 2026 Medically reviewed May 30, 2026 Study authors: Haddad Lisa, Arlt Felix, Güresir Erdem, Wach Johannes PubMed ↗ DOI ↗ By Dr. Julia Lee, PhD · Oncology, Genomics & Drug Development

Key Takeaway

Consider repeat microsurgery for recurrent VS only if tumor control outweighs high facial nerve deterioration risk.

This systematic review and meta-analysis examines repeat microsurgical resection compared with primary surgery for recurrent vestibular schwannoma. The analysis pooled data from small cohorts with retrospective designs and limited evidence. The study included 359 patients across various settings where follow-up duration was not reported.

The primary outcome assessed progression-free survival, while secondary outcomes included gross total resection rate, facial nerve function, hearing preservation, postoperative complications, and hydrocephalus or shunt dependency. The pooled gross total resection rate was 0.71 with a 95% CI of 0.46-0.87. Tumor recurrences were not observed in the 49 patients included in that specific analysis.

Safety outcomes showed postoperative facial nerve deterioration in 43% of cases with a 95% CI of 0.29-0.58. Cerebrospinal fluid leakage occurred in 11% of cases with a 95% CI of 0.05-0.21. Serious adverse events were not reported, but discontinuations and tolerability data were not reported. The authors note that evidence is limited and inconsistently reported.

The authors conclude that repeat microsurgery provides good tumor control but carries higher risks of facial nerve deterioration and other complications compared with primary surgery. This practice relevance applies to patients with recurrent vestibular schwannoma. Causality and effectiveness comparisons remain uncertain due to the observational nature of the included studies.

Study Details

Study typeMeta analysis

Sample sizen = 359

EvidenceLevel 1

PublishedMay 2026

PMID42215714

View Original Abstract ↓

BACKGROUND: Vestibular schwannomas (VS) are benign tumors of the eighth cranial nerve. While gross total resection (GTR) is often achieved in primary surgery, recurrence remains a therapeutic challenge. Repeat microsurgery is a key treatment option, but evidence is limited and inconsistently reported. This study systematically synthesizes current data on outcomes after repeat microsurgical resection for recurrent VS. METHODS: A systematic PubMed search identified studies reporting outcomes of repeat microsurgery for recurrent VS. Extracted data included patient characteristics, GTR rate, progression-free survival (PFS), facial nerve function (House-Brackmann scale), hearing preservation, postoperative complications, and hydrocephalus or shunt dependency. Pooled analyses using random-effects models estimated summary proportions across studies. RESULTS: Ten studies including 359 patients met inclusion criteria. The pooled GTR rate was 0.71 (95% CI: 0.46-0.87). Four studies (49 patients) reported PFS, with no tumor recurrences (pooled proportion = 1.00). Postoperative facial nerve deterioration occurred in 43% (95% CI: 0.29-0.58). Cerebrospinal fluid (CSF) leakage was the most frequent complication (11% (95% CI: 0.05-0.21)). Between-study heterogeneity was low to moderate in most of the studies (I² = 0-38.6%). CONCLUSIONS: Repeat microsurgery for recurrent VS provides good tumor control but carries higher risks of facial nerve deterioration and other complications compared with primary surgery. Current evidence is limited by small cohorts and retrospective designs. Standardized reporting and prospective multicenter studies are required to improve treatment strategies for this rare and challenging condition.