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Case illustration of endoscopic submucosal excavation. (A) We could see a submucosal tumor in the gastric corpus; (B) after making dots and submucosal injection, we precut the mucosal and submucosal layer covering the submucosal tumor to expose the tumor; (C) excavate the tumor from the muscularis propria layer; (D) the wound surface after tumor removal; (E) close the wound with several clips; (F) the resected tumor.
