頸部への放射線照射による頭蓋外内頸動脈瘤の1症例

A Case of Radiation Induced Aneurysm of Extracranial Carotid Artery

I．はじめに

　頸部への放射線照射後，頸動脈に動脈硬化類似の内膜肥厚を呈したり，出血を起こす等の報告は散見される^{6,11,12,14,18）}．しかし放射線照射後に動脈瘤を生じた症例は極めて稀で^4），その発生病理については不明な点が多い．今回，われわれは頸部への放射線照射後，およそ30年目に内頸動脈より仮性動脈瘤を生じた1例を経験し，その病態と発生機序について検討を加えたので報告する．

An unusual case of post-irradiation aneurysm of ex-tracranial internal carotid artery is presented.

A 70-year-old man, complaining of left cervical throb-bing mass with focal pain, was admitted on February 8, 1985. It was noted, from his past history, that he had had surgery of the removal of cervical lymphnodes and that unknown dosage of irradiation had been added to the cervical region 30 years before.

Left carotid angiography (on admission) demonst-rated a giant aneurysm in the cervical portion of inter-nal carotid artery.