Relationship between anomalies of female genital tract and endometriosis

Congenital anomalies of genital tract are caused by sex chromosome abnormality or abnormal embryonic development or embryonic development arrest.They mainly include vaginal and uterine malformations and often are concurrent with anomalies in urinary system.The women with obstructive anomalies of genital tract such as imperforate hymen,transverse vaginal septum and vagina atresia and so on are apt to suffer from endometriosis because outflow of menses is blocked and the menses reflex into the pelvic cavity,the endometria in it implant elsewhere.However,there are many reports of endometriosis related to non-obstructive anomalies such as rudimentary horn of uterus,uterus unicornis,in which countercurrent of menses is still an important contributing factor. Endometriosis of those women with Mayer-Rokitansky-Kuster-Hauser(MRKH) syndrome may be associated with coelomic epithelization.