于宫内股异位症系指子宫腔外有子宫内膜发生。7％～15％有生育能力妇女可累及本病。本病的发生率尚无报道。肠道子宫内膜异位症为3％一34％，其中7O％以上发生于直肠乙状结肠，小肠，尤其是末端回肠发生率约为6％，盲肠和阑尾发生率为3％。出现临床症状者多因肠腔逐渐狭窄所致 Ectopic pregnancy in the uterus refers to the uterine cavity outside the endometrium. 7% ~ 15% women with fertility can be affected by the disease. The incidence of this disease has not been reported. Intestinal endometriosis is 3% to 34%, of which 7O% occurred in the rectosigmoid colon, small intestine, especially the incidence of end-ileal about 6%, the incidence of cecum and appendix 3%. Clinical symptoms appear more due to the narrowing of the intestine