A case of an extragastrointestinal stromal tumor in the anterior pararenal space

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  • 前腎傍腔に発生した消化管外GISTの1例

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Abstract

Most extragastrointestinal stromal tumors (EGISTs) develop in the mesenterium or the omentum. EGISTs located in the anterior pararenal space are uncommon. A 74-year-old woman was found to have a mass on follow-up ultrasonography done for a previous cholecystectomy. Abdominal computed tomogram showed a well-defined, inhomogeneously enhanced, 8-cm-diameter tumor behind the stomach. T2-weighted MR imaging showed that the tumor had a heterogeneous high signal intensity with some higher signal intensity. At laparotomy, the tumor was found at the dorsal aspect of the bursa omentalis. There was no continuity between the tumor and the gastrointestinal tract. The tumor was extirpated with a safety margin. Macroscopically, the tumor was dark reddish, and hemorrhagic foci were recognized on the cut surface. Histological examinations revealed palisading elongated nuclei. Immunostaining for CD117 was positive. As a result, the tumor was diagnosed as an EGIST. Although, EGISTs should be considered in the differential diagnosis of abdominal mass lesions without connection to the gastrointestinal tract.

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