反衝損傷により発生したPosterior fossa subdural effusionの1例

Posterior Fossa Subdural Effusion Resulted from Contrecoup Mechanism: A case report and a review of the literature

I．はじめに

　外傷によるPosterior fossa subdural effusionは，テント上に比べ数は少なく，CT導入前は比較的診断が難しい病態であった．

　また外傷性後頭蓋窩損傷は，そのほとんどが後頭部受傷によるものであり，前頭部受傷によるものは非常に稀であるとされている．最近われわれは，前頭部受傷後にみられたposterior fossa subdural effusionが自然治癒した興味ある症例を経験したので，文献的考察を加えて報告する．

In contrast with contrecoup frontal injury, contrecoupposterior fossa injury is said to be a very rare clinical entity.This is a report of the case whose CT scan was normal beforetrauma, and after an obvious forehead trauma showedcontrecoup posterior fossa subdural effusion.

This 3-year-old boy was admitted to the hospital withheadache and vomiting on October 29, 1980. Six days beforeadmission he slipped and fell, striking his forehead. Hesustained a large subcutaneous hematoma in the forehead.One day after the trauma he developed headache and vomit-ing, which lasted as long as to the hospitalization.