Video Head Impulse Test in Vestibular Schwannoma: Relevance of Size and Cystic Component on Vestibular Impairment

Objectives: Tumor factors that influence vestibular function in vestibular schwannoma (VS) have not been properly described. We evaluated whether cystic VSs have different vestibular function than solid VS. Tumor size on vestibular function was also evaluated. Study Design: Cross-sectional study. Setting: Tertiary referral center. Patients: Forty-one cases of sporadic, untreated VS. Intervention: Evaluation with video head impulse test and MRI. Main Outcome Measures: Tumors were classified as solid, heterogeneous, or cystic and by size using the Hannover classification. Vestibulo-ocular reflex (VOR) gain was correlated to tumor size and cystic status. Results: Large VS had worse VOR gain than small lesions (p 

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