Abstract
A case of saccular aneurysms of the posterior inferior cerebellar artery and anterior inferior cerebellar artery associated with arteriovenous malformation is presented. The arteriovenous malformation was fed by superior cerebellar artery and posterior inferior cerebellar artery. The arteriovenous malformation was totally extirpated and the anterior inferior cerebellar artery aneurysm was clipped in two-stage operations. The posterior inferior cerebellar artery aneurysm decreased its size after the operation. The association of arteriovenous malformation and arterial aneurysm in the posterior fossa is reviewed.