Abstract
A 54-year-old man transferred to our emergency department due to sudden vertigo and left-side hearing impairment lasting several hours was found in clinical examination and audiovestibular tests to have profound sensorineural hearing loss and spontaneous right horizontal rotatory nystagmus. He had no other neurological deficits and was given intravenous steroids.
On day 4, he reported mild numbness in the right hand. MRI showed infarctions in the left pons (basilar artery region) and in the left middle cerebellar penduncle (AICA region). These were followed by a right Babinski reflex, gait ataxia, and delayed left-sided facial palsy with newly left horizontal rotatory nystagmus. Antiplatelet agents and anticoagulation therapy were begun. He recovered completely except for the profound hearing loss.
