後腹膜神経鞘腫の1例

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  • A CASE OF RETROPERITONEAL SCHWANNOMA

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A 56-year-old man was admitted to the hospital because of right upper quadrant pain on August 18, 1995. The patient was diagnosed as having cholelithiasis and choledocholithiasis, but a circular tumor in the left superior intrarenal retroperutoneal region was confirmed on an abdominal CT. The tumor was adjacent to the left adrenal gland and was ill-defined. Magnetic resonance imaging (MRI) revealed a low density area on T1-weighted image and a fluid level on T2-weighted image. It was diagnosed as left endocrine non-functioning adrenal tumor. On September 11, the patient was operated on when a spherical tumors 35×34×30mm in size was confirmed on the left side of the inferior mesenteric vein in the retropancreatic region. The tumor was easily freed from the left adrenal gland and completely removed. Histopathologically, it was benign schwannoma in which Antoni type A and B coexisted.<br> Schwannomas arising in the upper portion of the kidney present difficulty in differential diagnosis from adrenal tumors. In this courtry, only 10cases including this case which were clearly documented have been seen in the literature so far. A review of the Japanese literature mainly based on an analysis of these 10 cumulated cases is also presented here.

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