LAUSR

A 46-year-old woman presented with a gastric subepithelial tumor. The tumor was incidentally detected during a screening endoscopy. The tumor was located on the posterior wall of the gastric fundus, without any observable erosion or ulceration on its surface (Fig. 1A). When compressed using biopsy forceps, the tumor felt hard and partially fixed. On endoscopic ultrasonography, the tumor measured 0.8 cm in diameter and presented as a heterogeneously hypoechoic lesion in the submucosal layer (Fig. 1B). Examination of the specimen obtained from the endoscopic biopsy revealed only chronic gastritis. The patient underwent a follow-up endoscopy 2 years later, which revealed that the tumor size had increased (Fig. 1C). Therefore, traction-assisted endoscopic submucosal dissection was performed (Fig. 1D-F). What is the most likely diagnosis? BOOST YOUR LEARNING WITH QUIZ