[Two cases of persistent trigeminal artery variant].

Two cases of persistent trigeminal artery variant were found in 2000 cases who had examination of cerebral angiography in our hospital from 1975 to 1986. The first case was a 44-year-old female who admitted in our hospital for the examination of vertigo. Cerebral angiography demonstrated a superior cerebellar artery originating from the precavernous portion of the right internal carotid artery. The second case was a 67-year-old female who admitted in our hospital for the treatment of subarachnoid hemorrhage. Cerebral angiography demonstrated an anterior inferior cerebellar artery originating from the precavernous portion of the right internal carotid artery. In this case, a fusiform aneurysm was found in the origin of the persistent trigeminal artery variant. The ruptured aneurysm was thought to be a basilar artery aneurysm.