Uterus-like mass of ovarian ligament: Image diagnosis and management by laparoendoscopic single-site surgery

Uterus-like mass composed of a cavity lined by mucosa resembling endometrium and surrounding smooth muscle layer simulating myometrium is an extremely rare disease entity of which the histogenesis is presently unknown. A 39-year-old, gravida 2, para 2, woman presented with sudden onset of lower abdominal pain and was found to have left adnexal mass with unusual image diagnostic appearance. The adnexal mass arising from the left ovarian ligament was excised by laparoendoscopic single-site surgery. Histopathological diagnosis was uterus-like mass of ovarian ligament.