由于诊断技术的进步,发现在早期大肠癌中息肉恶变占多数。据日本1966年3月至1973年间土屋氏统计,在早期大肠癌113个病变中,息肉隆起型占77%(Ⅰ型),扁平隆起型(Ⅰ_a型)占15%,因此大肠息肉恶变的合理治疗日益受到重视。由于早期大肠癌形态的不同,据病理学统计其浸润深度亦不同。长迥报道,在35例早期大肠癌中,有蒂息肉状癌19例,除1 Due to advances in diagnostic technology, it has been found that malignant colorectal cancers account for the majority of malignant colorectal cancers. According to the statistics of Touhoku between March 1966 and 1973 in Japan, among 113 lesions of early colorectal cancer, polyp uplifted type accounted for 77% (type I) and flattened type (type I_a) accounted for 15%. Therefore, colorectal malignancy is reasonable. Treatment is increasingly valued. Due to different forms of early colorectal cancer, the depth of invasion is also different according to pathological statistics. Long Yao reported that in 35 cases of early colorectal cancer, there are 19 cases of polypoid carcinoma, except 1