PERIPHERAL ANTERIOR INFERIOR CEREBELLAR ARTERY ANEURYSMS

Two cases of peripheral anterior inferior cerebellar artery (AICA) ane urysms are reported. The first case was a 60-year-old man who showed f requent attacks of subarachnoid hemorrhage (SAH) and hearing disturban ce. His aneurysm was obliterated by trapping the AICA and his neurolog ic status was unchanged compared with preoperatively. The second case had SAH without cranial nerve involvement; this aneurysm was obliterat ed by neck clipping. He was discharged without neurologic deficit. Per ipheral AICA aneurysm has already been reported in 48 cases including arteriovenous malformation-associated cases. This aneurysm may show cr anial nerve involvement (seventh and eighth) without SAH as in the cas e of internal carotid-posterior communicating artery aneurysms. We rev iew the clinical signs of these cases and discuss them from the point of view of anatomic variations of the AICA and internal auditory arter y.