Biopsy at the rectum to send pathological results are generally seen in inflammatory reaction, benign tumors and malignant tumors. 1. Inflammatory reaction, normal or localized with slight inflammation, basically normal. 2. Benign tumors, abnormal proliferation of intestinal cells and tissues, slow growth, peripheral formation of the envelope, and adjacent normal tissue demarcation is obvious, not metastatic after surgical resection, such as rectal polyps, adenomas and so on. 3. malignant tumors, malignant cells and tissues appear on the rectal mucosa to invade the neighboring tissues, including rectal malignant tumors, intestinal cancer, adenocarcinoma, etc. Biopsy pathological results provide a diagnostic criterion for the type and degree of malignant tumors as well as the future treatment plan.