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1溃疡性结肠炎与结肠直肠癌溃疡性结肠炎并发结肠肿瘤发生率较正常人群明显增高，绝大多数的结肠肿瘤是腺癌，原发性结肠淋巴瘤和多中心类癌肿瘤也有报道。发病机制：溃疡性结肠炎并发结肠癌发生率增高的原因至今仍不清楚。粘膜内在的缺陷或来自长期慢性炎症的结果，可能是最主
1 Ulcerative colitis and colorectal cancer Ulcerative colitis complicated by colon cancer incidence was significantly higher than the normal population, the vast majority of colon cancer is adenocarcinoma, primary colon lymphoma and multicentric carcinoid tumors have also been reported. Pathogenesis: The cause of the increased incidence of colon cancer associated with ulcerative colitis remains unclear. Mucosal intrinsic defects or results from long-term chronic inflammation may be the most important