Infarction in the anterior inferior cerebellar artery (AICA) territory is rare, and most reports on such infarction have been restricted to autopsy studies. We analyzed the clinical figures of 5 patients with AICA territory infarction diagnosed by magnetic resonance imaging (MRI). They all developed dizziness or vertigo, unilateral ataxia and homolateral hearing impairment. The MRI demonstrated ischemic lesions in the ipsilateral middle cerebellar peduncle. All patients showed excellent neurological recovery and were ambulatory at discharge. In our series, unilateral hearing impairment was the most crucial sign for diagnosis of the AICA syndrome. Results for the auditory brain stem response suggested that the hearing impairment may be partly attributable to chochlear ischemia.

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