Hyperplastic polyposis associated with two asynchronous colon cancers

Figure 1 A: Resected sigmoid colon. The adenocarcinoma, 4.0 cm × 2.5 cm in size, shows ulcer formation with localized infiltrative growth. Multiple small polyps are seen in the resected colon (arrow); B: Well-differentiated adenocarcinoma located in the sigmoid colon (HE, × 100). High columnar tumor cells have proliferated to form papillary or tubular structures; C: Hyperplastic polyp located in the resected sigmoid colon (HE, × 100). The epithelial cells are arranged in a serrated fashion and have no atypical features.