[Extravesical ectopy of accessory ostium uterus]

Two cases with rare location of ectopic accessory ostium ureteris in the cervix uteri are described. This abnormality can be combined with a vaginal and/or uterine developmental defect, leading to female sterility. Another probable cause of sterility in this uterine duct abnormality is constant release of acid urine into the uterine cavity, maintaining chronic endometritis. This was confirmed by pregnancy which occurred in a patient after heminephrurethrectomy, when urine release into the uterus ceased. A sign pathognomonic for extravesical ectopy of the ostium, constant urine release in the presence of normal urination, can be absent in uterine ectopy of ostium ureteris. This is due to several factors: reduced function of the dysplastic upper segment of the doubled kidney with production of negligible amounts of the urine and because the uterus and vagina can serve as accessory reservoirs for the urine. Pregnancy and labor in such cases often become the factors leading to manifestation of the abnormality.