[Rare malformation of the anterior-inferior cerebellar artery. Cerebellar hemisphere angioma and aneurysm of the labyrinthine artery].

The AA relate a case of a complex malformation of the AICA characterized by aneurysm of the internal auditory artery developed inside the internal acoustic channel associated with an angioma fed by the cerebellar branch of the same artery. During a long period with dizziness, tinnitus, headache in the occipital region, mild sensoneural retrocochlear hearing loss a subarachnoid hemorrhage occurred. The vascular malformations were visualized by a vertebral angiography and the axial projection resulted to be the most important clue. The AA report the case for its rarity and emphasize the vascular origin of certain unexplained kinds of vestibular syndromes in young patients.