ＦＤＧ‐ＰＥＴにより発見された横行結腸ＧＩＳＴの１例

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  • A CASE OF GASTROINTESTINAL STROMAL TUMOR OF THE TRANSVERSE COLON DETECTED BY FDG-PET

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The patient was a 57-year-old man. PET showed abnormal isotope accumulation in the vicinity of the horizontal part of the duodenum. The patient was operated on with a diagnosis of gastrointestinal stromal tumor (GIST) of the duodenum. The tumor about 3cm in diameter was present in a portion which was surrounded by the uncus of the pancreas, horizontal part of the duodenum, and right-sided transverse colon. To achieve an en-bloc resection, we performed pancreatoduodenectomy associated with right hemicolectomy and partial resection of right wall of the portal vein. Pathological findings disclosed that the tumor was 2.5cm in diameter, had grown partially involving the duodenal muscular layer, and connected with the muscular layer of the transverse colon. Histological findings showed trabecular arrangement of spindle shaped cells. Immunohistochemical studies revealed that the tumor cells were only positive for c-kit and negative for CD34, SMA, and S100. Thus GIST of the transverse colon was diagnosed. This case has suggested the usefulness of FDG-PET as a new diagnostic method of GIST.

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