Gastric GIST: minimally invasive surgical modalities
Epublication WebSurg.com, Nov 2015;15(11). URL: http://websurg.com/doi/lt03enkong001
Gastrointestinal stromal tumor (GIST) is the most common mesenchymal tumor, and the stomach is the most frequent location (50-60%). Gastric GIST presents as a submucosal tumor and is often found incidentally. Submucosal tumors greater than 2cm are indicated for resection. Indication for laparoscopic surgery is not strictly determined by the size, but whether surgery can follow resection principles, 1) R0 resection with histologically negative margins, 2) all efforts are made to prevent tumor rupture. Wedge resection using a linear stapler, also called “exogastric resection” is effective in most cases. However, the operator should pay attention to align the direction of the linear stapler “transversely” to the long axis of the stomach, otherwise it can cause gastric lumen narrowing after resection, especially in case of a relatively large tumor with endophytical growth. Endoscopy is very useful to identify and define tumor resection margins for endophytic tumor, and the “eversion” technique is one option to reduce the amount of normal mucosa resection. GIST cases located at the posterior wall of the upper stomach are technically challenging, and transgastric or intragastric techniques are suggested as good surgical options for such tumors. Laparoscopic or endoscopic “coring out” techniques can be dangerous, because of the high risk of tumor rupture and gastric wall perforation, which can cause peritoneal seeding when both take place simultaneously.