Aneurysm of the Distal Anterior Inferior Cerebellar Artery —Case Report

A 38-year-old female presented with vertigo, right hearing disturbance, and slight headache which were treated medically. However, she suddenly developed severe headache with vomiting and vertigo. Computed tomography revealed subarachnoid hemorrhage, and right vertebral angiography disclosed a rare aneurysm at the distal portion of the anterior inferior cerebellar artery. She underwent a right suboccipital craniectomy in the lateral position. The aneurysm could not be clipped because the aneurysm was tightly adhered to the brainstem, so it was trapped. Postoperatively, she showed slight VIIIth to Xth cranial nerve disturbances. Three months postoperatively, the IXth and Xth cranial nerve disturbances had disappeared, but the tinnitus and right hearing disturbance were still present. The initial symptoms were probably caused by minor bleeding from the aneurysm.