Review Question - QID 212832

A 44-year-old man presents to the emergency department with dizziness. He states his symptoms started a few days ago and have been gradually worsening. The patient recently had a cold that he recovered from spontaneously. He states that laying down flat may cause dizziness to return and also he endorses a ringing in his ears. His temperature is 98.7°F (37.1°C), blood pressure is 159/92 mmHg, pulse is 88/min, respirations are 12/min, and oxygen saturation is 99% on room air. Physical exam is notable for predominantly left-sided hearing loss and horizontal nystagmus. The patient’s initial laboratory tests are unremarkable and an MRI is performed as seen in Figure A. Which of the following is the most likely diagnosis?