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(a) Surveillance colonoscopy showed a type 2 tumor near the stoma opening. (b) A resected specimen from the operation showed a type 2 tumor measuring 35×30 mm. An endoscopic submucosal dissection scar was not detected. (c) Hematoxylin and eosin staining ×12.5. Histopathological examination revealed moderately differentiated adenocarcinoma, which was similar to the endoscopic submucosal dissection specimen.
