中脳被蓋部に限局した外傷性血腫の1例

A Case of Hematoma Localized to Midbrain Tegmentum Following Closed Head Injury

I．はじめに

　従来，頭部外傷による一次性脳幹部損傷の診断は，主に臨床所見と剖検所見によって決定され，大多数において転帰不良例である^{2,6,10,13,16,17）}．最近，急性期頭部外傷において，CT上確認された一次性脳幹損傷の報告例が散見される^7,9,23）．しかしそのなかには，転帰の良かった脳幹部損傷例は意外と少ない．今回われわれは，CT上確認しえた中脳被蓋部に限局した外傷性血腫の1例を経験したので，臨床所見，その発生機序を中心に，文献的考察を加え報告する．

Cases of primary brain stem lesion following closed head injury, verified on CT scan, have been increasingly reported recently. However, most of them have supratentorial lesions in addition to brain stem, resulting in a poor outcome.

In this paper, a case of localized brain stem hematoma following closed head injury, is reported based on CT findings.