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a Gross examination showing an ulcerated, cauliflower-shaped, soft tumor, measuring 7 × 8 × 3 cm, located in the lower rectum; the proximal colon is also resected. b The distal margin of the rectum is more than 1.5 cm from the tumor. c Histologic examination showing a moderately differentiated tubular adenocarcinoma, almost entirely intramucosal, with focal invasion of the submucosal layer
