[Endometriosis of the inguinal ligament as a rare differential diagnosis of inguinal space-occupying lesion].

A case of endometriosis infiltrating the inguinal ligament is presented. As a rare condition involving of the extraperitoneal portion of the round ligament was not seen. Ultrasonography revealed a hypoechoic tumor with internal anechoic areas. Surgical exploration was carried out in the assumption of a relapse of an inguinal hernia. Microscopically, endometrial glands, fibrosis and old hemorrhage were seen. Laparoscopy revealed no evidence of pelvic endometriosis. We conclude that endometriosis must be considered in the differential diagnosis of palpable lesions of the groin in women of reproductive age. Surgery in cooperation with the gynecologist is the treatment of choice.