Persistent trigeminal artery variantの2例

Two Cases of Persistent Trigeminal Artery Variant

I．はじめに

　persistent trigeminal artery（以下PTAと略す）は内頸動脈と脳底動脈を連絡するcarotid-basilar anastomosisのなかでも最も高頻度に認められるものである．

　1972年Tealら^10）はPTAと類似の起始部を持つが，脳底動脈との交通はなく，直接小脳動脈に終るcarotid-cerebel—lar anastomosisというべき症例を報告し，これをpersistent trigeminal arteryvariant（以下PTAVと略す）と推測した．以後，これまでに十数例のPTAVの報告がなされている^2-6,8-11）．

Two cases of persistent trigeminal artery variant were found in 2000 cases who had examination of cere-bral angiography in our hospital from 1975 to 1986.

The first case was a 44-year-old female who admit-ted in our hospital for the examination of vertigo. Cere-bral angiography demonstrated a superior cerebellar artery originating from the precavernous portion of theright internal carotid artery.

The second case was a 67-year-old female who admitted in our hospital for the treatment of subarach-noid hemorrhage.