Endometriosis is a chronic gynecological pathology related to the presence of hormonally-dependent endometrial tissue outside the uterus. Its frequency in the adolescent is not negligible with a symptomatology dominated by pelvic pain twisted on the account of dysmenorrhea. Pelvic ultrasound is a basic examination for diagnostic guidance magnetic resonance imaging is more sensitive to visualizing deep endometriosis. Surgical and medical treatments are complementary. The evolution is marked by frequent recurrences in the teenager which can hinder the social life as well as the obstetric prognosis.