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Case illustration of endoscopic submucosal dissection. (A) We could see a submucosal tumor in the gastric fundus; (B) after making dots and submucosal injection, we precut the mucosal and submucosal layer using a dual knife, and the submucosal tumor is shown; (C,D) dissect the tumor with a dual knife; (E) close the wound with several clips; (F) the resected tumor.
