大肠息肉是上皮来源隆起于粘膜的肿物,它包括肿瘤性和非肿瘤性。因为肉眼很难判断该隆起赘物是肿瘤性或非肿瘤性,故统称为息肉。肿瘤性息肉也称腺瘤,事实上与大肠癌发生关系密切,是癌前期病变;非肿瘤性息肉与癌发生关系甚少。Morson认为大肠癌除了溃疡性结肠炎外,几乎均来源于腺瘤,其理由①组织学上可发现腺瘤演变成癌的移行过程;②大肠癌中往往能见残存腺瘤组织,它的比例随着癌 Colorectal polyps are epithelial tumors that arise from the mucous membranes. They include neoplastic and nonneoplastic. Because it is very difficult for the naked eye to judge whether the raised bump is neoplastic or non-neoplastic, it is collectively referred to as a polyp. Tumorous polyps, also known as adenomas, are closely related to the occurrence of colorectal cancer and are precancerous lesions; non-neoplastic polyps have little to do with carcinogenesis. Morson believes that in addition to ulcerative colitis, colorectal cancer is almost all derived from adenomas. The reason is 1 histologically, the progression of adenomas into cancer can be found; 2 colon cancer often can see residual adenoma tissue, its proportion With cancer