胃小網に発症した巨大GISTの一例

Abstract

Gastrointestinal stromal tumor (GIST) is a mesenchyrnal tumor that originates mainly in the stomach and small intestine, but rarely in other tissues than the gastrointestinal tract. We report an unusual case of a giant GIST of the lesser omentum. A 45-year-old woman presented with a giant tumor of the stomach and was admitted to our hospital for investigation of the tumor. We diagnosed it as a GIST of the stomach that arose from the lesser omentum and removed it without difficulty. The tumor was composed of spindle-shaped cells and immunohistochemical examination showed that it was positive for c-kit, CD34, and α-SMA, but negative for S-100 protein. These findings were histologically consistent with GIST features. The patient had an uneventful postoperatlve course.