頭蓋骨欠損とともにその直下にporencephalic cystの認められた1成人例

A Case Report of Cranial Bone defect with Porencephalic Cyst in an Adult

I．はじめに

　Growing skull fractureは幼小児期におこる頭蓋骨骨折の一形態で小児頭部外傷の0.03-2.5％といわれているが，成人になって発見される例はほとんど報告がない．さらにその発生機序は硬膜の破綻による骨癒合機転の障害といわれている．われわれはこの度，頭蓋骨欠損とその直下にporencephalic cystを有した1成人例を経験し，その発生機転は幼少児期に発生したgrowing skull fractureによるものであると思われたので若干の文献的考察を加えてこれを報告する．

A case of cranial bone defect with porencephalic cyst in an adult was reported. A 47 year-old male was admitted with epilepsy. He had a round lytic bone de-fect lesion in the left frontal skull. The porencephalic cyst was under the bone defect. The mechanism of bone defect is thought to be as follows. He had re-ceived some head trauma in childhood and the frontal skull bone had fractured. The contusioned brain changed to a porencephalic cyst. The linear bone frac-ture may have enlarged according to the mechanism of a growing skull fracture. Persistent pulsative pressure from the porencephalic cyst toward the fractured bone edge might be able to make the bone defect oval.