绒毛状腺瘤恶变的腺癌，肿瘤呈息肉状微红色，肿瘤表现出血使得粪便潜血检查呈阳性，该肿瘤块位于乙状结肠，指诊触不到，但结肠镜检病变清楚可见。
This is an adenocarcinoma arising in a villous adenoma. The surface of the neoplasm is polypoid and reddish pink. Hemorrhage from the surface of the tumor creates a guaiac positive stool. This neoplasm was located in the sigmoid colon, just out of reach of digital examination, but easily visualized with sigmoidoscopy.
