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I.はじめに
髄膜腫の病因に関しては,その他の腫瘍一般と同様に確立した見解は得られていない,しかし,Cushing5)が外傷が発生の要因の1つであることを唱えて以来,成因に関して数多くの論議がかわされており,放射線照射もその要因の1つに数えられている.
今回われわれは,第3脳室腫瘍に対して放射線療法を行った後に14年を経て発生した左側頭部巨大髄膜腫の症例を経験したので報告する.
A case of meningioma following irradiation for a tumor of the third ventricle is reported.
A four year old girl was admitted complaining of headache and vomiting. The pneumoventriculography revealed marked hydrocephalus and a mass lesion at the third ventricle. Under the diagnosis of a tumor of the third ventricle, ventriculo-atrial shunt and radiation therapy were performed. Totally. 4170 rad irradiation was directed from left temporal area through a single portal. Though she had no com-plaints for fourteen years, at the age of eighteen, she was admitted complaining of right hemiparasis and general convulsion.
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