A 52-year-old man presents with a 3-year history of progressive hearing loss in the right ear. Audiometry shows the pattern marked **A** in the diagram — asymmetric high-frequency sensorineural hearing loss with disproportionately poor speech discrimination (rollover on PI-PB testing) compared to pure-tone thresholds. He also reports unilateral right-sided tinnitus and mild imbalance. Which of the following is the most likely diagnosis?
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