Influence of Posterior Fossa Volume on Clinical Outcomes After Vestibular Schwannoma Resection

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To determine the influence of posterior fossa dimensions on surgical outcomes after vestibular schwannoma management.

Study Design:

Retrospective chart review.


Tertiary care academic medical center.


Patients with sporadic vestibular schwannomas who underwent surgical resection via retrosigmoid or translabyrinthine techniques.



Main Outcome Measures:

One and two-way analysis of variance (ANOVAs) of the cohort based on volumetric and clinical outcome groupings.


A total of 95 patients were identified. A one-way ANOVA looking at the entire cohort of patients showed that outcomes like surgical time (p < 0.001) and whether a Good Outcome (House–Brackmann score of 1 or 2, no complications, and a complete resection) was achieved (p = 0.009) correlated very well with preoperative tumor volume, but not with posterior fossa volume (p = 0.412 and p = 0.345, respectively). However, in medium sized tumors, House–Brackmann group was correlated with posterior fossa volume (p = 0.032).


The present data suggest a small effect of posterior fossa size on some clinical outcomes in medium sized vestibular schwannomas.

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