外傷後，床状突起上部内頸動脈に動脈瘤様陰影を生じた1例

Posttraumatic Aneurysm-like Shadow at the Supraclinoid Portion of the Internal Carotid Artery:A case report

I．はじめに

　外傷性脳動脈瘤は，穿通性および非穿通性頭部外傷や，手術時の血管損傷に起因して発生することはよく知られており^3,6,9），中大脳動脈，前大脳動脈の分枝や，頭蓋底部あるいは海綿静脈洞部の内頸動脈に起こることが多いとされている^2,3,7）．今回われわれは，非穿通性頸部外傷直後に頭蓋底骨折を伴い，床上突起上部内頸動脈に動脈瘤様陰影を認めた1手術例を経険したので報告する．

Traumatic cerebral aneurysms occupy less than 1%in all cerebral aneurysms and the onset usually occurs two to three weeks after the head injury.

The authors present a case revealing an aneurysm-like shadow at the supraclinoid portion of the internal carotid artery immediately after the head injury.

A 45-year-old man was admitted in a semi-comatose state, with bleeding from the nose and the ear. He presented anisocoria, with the left pupil larger, and absence of light reflex of the pupil.

Roentgenographic examinations revealed fractures of the skull, the left radius, and the pelvis.