一、放射性吸收不良:因盆腔、腹腔或腹膜后恶性肿瘤经放射治疗(~(60)Co,直线加速器),超高压X线外照射或镭内置放疗后肠粘膜损伤可致吸收不良。 (一) 发病率:当放疗照射量超过50戈瑞(Gray)即5000拉德。约2.4％～8％发生放射性肠炎。各肠段对射线敏感性有别,按以下顺序递减;12指肠、空肠、回肠、横结肠、乙状结肠、直肠。 (二) 发病机理:1.早期肠粘膜上皮细胞增生受抑制,当放疗剂量不过量,停止1～2周后肠 First, the poor radiological absorption: After pelvic, abdominal or retroperitoneal malignant tumors by radiation therapy (~ (60) Co, linear accelerator), EHV X-ray external radiotherapy or radiotherapy after radiotherapy intestinal mucosal injury can lead to malabsorption. (A) Incidence: When radiation exposure exceeds 50 Gray (5000) Rad. About 2.4% to 8% of the occurrence of radiation enteritis. Each bowel radiosensitivity are different, according to the following order of decreasing; 12, the intestine, jejunum, ileum, transverse colon, sigmoid colon, rectum. (B) the pathogenesis: 1. Early intestinal epithelial cell proliferation inhibited, when the dose of radiotherapy is not excessive, stop 1-2 weeks after the intestine