超音波断層検査で偶然発見された胃の有茎性壁外発育型Gastrointertinal stromal tumor(GIST)の1例

Abstract

A 55-year-old woman was admitted to our hospital complaining of epigastral distress. Endoscopy of the gastro-intestinal tract revealed no remarkable finding, but a tumor was detected near the kidney by abdominal ultrasonography. Computerized tomography revealed that the tumor had a lower density than that of the liver, and was enhanced by CE/CT. Operative findings showed that the tumor had grown out of the gastric wall with a short peduncle derived from the posterior wall of the stomach. It was diagnosed as a gastrointestinal stromal tumor with exogastric pedunculated development. Pathological examination revealed that the tumor had little symptom of malignancy such as frequent mitosis, and that it was connected to the muscular layer of the gastric wall by the thin peduncle. Immunohistdlogical study confirmed that the tumor was the smooth muscle type of GIST because of the positive expression of CD34, c-kit and αSMA.