This lecture presents ureteral endometriosis, which is a rare pathology (0.1% of cases). In 50% of cases, the condition is asymptomatic and can lead to loss of renal functions. In the literature, ureteral endometriosis increases with the presence of rectovaginal endometriosis, which does not appear in the study presented (221 cases of endometriosis, 19.5% of which are ureteral tract endometriosis). It seems to be significantly associated with uterosacral ligament (USL) endometriosis (p=0.01) but not with bladder endometriosis. Medical treatment is not indicated and conservative laparoscopic surgical management shows a long-term relief of symptoms and a low rate of anatomical recurrence (0-11%).