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传统上50～75%大肠肿瘤的好发部位在28cm乙状结肠镜检查可见部位.作者20年来对结肠癌和腺瘤样息肉切除患者的研究证明位于右侧结肠的病变明确增加,尤以65岁以上及女性为著.对老年,特别是女性便血患者进行检查时使用全结肠镜和钡剂灌肠,发现右侧结肠发病率增加.这种模式的改变对息肉可发展为癌进一步提供了证据.目前这种变化的原因未明,可能和近年来环境致癌
Traditionally, 50 to 75% of colorectal tumors have a predilection site at 28 cm of sigmoidoscopy, and studies by patients with colon and adenomatous polyp resections over the past 20 years have shown a clear increase in lesions located on the right colon, especially over the age of 65 And feminine.The colonoscopy and barium enema were used to examine elderly patients, especially feminine bloody diarrhea, and the incidence of right colon was found to be increased.The changes in this model provide further evidence that polyp can develop into cancer.Currently The reasons for such changes are not yet clear and may have caused cancer in recent years