A 52-year-old woman presents with 2 years of progressive unilateral right-sided hearing loss, high-pitched tinnitus, and recent right-sided facial numbness in the V1-V2 distributions. Pure-tone audiometry shows right-sided high-frequency sensorineural hearing loss with disproportionate drop in speech discrimination at louder intensities (roll-over phenomenon). BAER reveals prolonged Wave I-III interval on the right. MRI brain with internal auditory canal protocol is performed. The structure marked **A** in the diagram—a T2-hyperintense mass in the right cerebellopontine angle—is noted to be avidly enhancing on gadolinium. Based on the clinical presentation and imaging findings, what is the most likely diagnosis?
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