Anterior inferior cerebellar artery aneurysm at the internal auditory meatus--case report.

The authors present a case of a ruptured anterior inferior cerebellar artery aneurysm at the right internal auditory meatus, the incidence of which is thought to be very rare. The patient experienced sudden onset of headache, vomiting, and right tinnitus. Moderate right peripheral facial paresis, hearing disturbance and diplopia appeared 2 weeks after the onset. These signs and symptoms improved to some extent after successful clipping of the aneurysmal neck.