A rectal GI stromal tumor completely resected with endoscopic submucosal dissection (with video)

GI stromal tumor (GIST) is a mesenchymal tumor derived from the interstitial cells of Cajal or their precursors. GISTs can arise at any location in the GI tract, especially in the stomach (60%-70%) and small intestine (25%-35%), but are detected only infrequently in the colorectum (5%) and esophagus (2%-3%). 1 Surgical resection has been the standard treatment for nonmetastatic GISTs. We report a case of rectal GIST that was completely removed en bloc by using endoscopic submucosal dissection (ESD).