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I.はじめに
computed tomoguaphy(CT scan)は脳腫瘍の病理組織型診断に多くの情報を与えてくれている.なかでもastrocytomaをはじめとするglioma, craniopharyn-gioma, hemangioblastoma,転移性脳腫瘍などの嚢胞性腫瘍の術前診断が正確となり,より適切な治療がなされるようになった.嚢胞性腫瘍のなかでも,髄膜腫が肉眼的に大きな嚢胞を伴う現象は非常に稀であり,CT scan導入以前では術前診断が容易でなかった.また髄膜腫が嚢胞を形成する機序は,いまだ充分に解明されておらず諸説がある.われわれはCT scanで大きな嚢胞を伴うのが予測できた髄膜腫の2例を経験したので,症例を報告するとともに文献的な考察を加える.
Although meningiomas are usually a solid and firmtumor, some are associated with diagnostically con-fusing large cysts. The authors experienced twocases of meningioma associated with large cyst (cysticmeningioma).
The first case was a 20-year-old female. She wasadmitted because of blurred vision. On admissionshe was slightly apathetic and showed bilateral papill-edema.
Computed tomography showed a large area of lowdensity in both frontal regions. CT scan after intra-venous contrast enhancement revealed an enhancingmural nodule attached to the falx.
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