Gastric malignant stromal tumor with long stalk impacted into duodenum

Most GIST have traditionally been classified as submucosal origin by upper gastrointestinal series (UGIS) or endoscopy. However, we experienced a gast rointestinal mesenchymal origin tumor expressed by polypoid mass with a lon g stalk. The gastric outlet was obstructed by the polypoid mass on the duod enum. The microscopic findings of the resected mass showed a stromal cell c omponent by immunohistochemical stain. We experienced gastric stromal tumor found as a polypoid mass with Long stalk which was easily detected by endo scopy. It would nor have been suspected as a stromal tumor as a result of e ndoscopic findings only.