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I.はじめ
明らかな外傷の既往や脳動脈瘤,動静脈奇形など出血源となる基礎疾患のない急性発症の硬膜下血腫は,急性特発性硬膜下血腫と呼ばれている11).この急性特発性硬膜下血腫は,皮質動脈破綻が原因と言われ,昭和45年以降コンピューター断層撮影(CT scan)の出現に伴い報告例が増加し3,7,11),われわれの調べ得た範囲で,少なくとも本邦で15例の報告がある1,4,6,8,12,16,17,19,20
われわれも急性特発性硬膜下血腫と考えられる症例を2例経験し,手術にて皮質動脈破綻を確認したが,1例は発症12日目に,他の1例は15日目に急速な意識障害の出現とCT scan上の著名な正中変位を認めたため緊急手術を必要とした.
Two cases of acute idiopathic subdural hematoma with delayed intracranial hypertension were presented.
The first case was a 68-year-old man admitted for vomiting following headache for eight days. There was no history of head trauma. A CT scan revealed a high-density mass that had a concave inner margin in the left temporo-parietal region with a slight midline shift. No vascular lesion was noted on the angiogram. The consciousness of the patient deteriorated suddenly onthe 12th day. An operation was performed because of a marked midline shift on the CT. At operation, a subdu-ral clot was removed.
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