Ureteral obstruction by endometriosis.

The clinicopathological features of 2 cases of ureteral endometriosis are presented. The difficulties in diagnosis and surgical management of ureteral endometriosis are discussed. We emphasized the importance of frozen section during surgery for the lower one third of ureteral obstruction in premenopausal woman. Moreover, it is suggested that the surgical procedure for ureteral endometriosis should be uretero-ureterostomy or ureterocystoneostomy in the early stage.