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I.はじめに
CT scanの普及に伴い,破裂脳動脈瘤が原因のくも膜下出血のCT像を検討した報告はいろいろあるが,その多くのものはくも膜下出血の程度の分類に関するものであり,破裂脳動脈瘤の部位とCT像を検討したものは少ない4,5,7,10,11,13).今回,破裂脳動脈瘤のうち後頭蓋窩脳動脈瘤の急性期例のCT像を検討したので報告する.
From April, 1978 through December, 1984, computed tomographic (CT) findings were carefully examined in 34 cases of initial subarachnoid bleeding due to a single ruptured aneurysm in the posterior fossa. All of the pa-tients were hospitalized within 3 days of the onset of symptoms. High-density areas, which indicate the pre-sence of subarachnoid clots, were evaluated in the in-terhemispheric and Sylvian fissures and the interpe-duncular, prepontine, ambient, and quadrigeminal cist-erns. The CT data suggest that hematomas in the four cisterns are thicker than those in the supratentorial sub-arachnoid spaces.
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