A CASE OF GASTROINTESTINAL STROMAL TUMOR (GIST) OF THE OMENTUM

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  • 大網原発ＧＩＳＴの１例

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Abstract

A 53-year-old woman was seen at the emergency outpatient clinic because of abdominal pain and abdominal distention. On physical examination abdominal tenderness and distension were noted. Abdominal ultrasonography and CT detected ascites in the abdominal cavity and a phyma consisting of intermingling solid regions and cystic regions over the upper abdominal region to pelvic cavity. Various tumor markers were in normal ranges. Ascites was bloody and the cytodiagnosis of it was class 1. The upper and lower intestinal endoscopy detected no abnormalities. Ovarian tumor was strongly suspected bases on the imaging findings, and surgery was performed. During surgery, a multilocular cystic phyma measuring 15×15 cm containing elastic blood clots was observed in the greater omentum, and the phyma was excised with the greater omentum. Pathological examination and immunohistological staining showed that the phyma was a CD34-, C-kit-, and desmin-positive mesenchymal tumor, and was diagnosed as primary GIST of the greater omentum. Since primary GIST of the greater omentum is very rare, we report it with a review of the literature.

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