Accessory ovary is a type of ovarian dysplasia, which is often defined as an ovarian tissue placed near and directly connected to the normal ovary or one of ovarian ligaments. It is often asymptomatic, mostly is found or diagnosed at laparotomy, laparoscopy or autopsy. Accessory ovary is often excised during surgery due to its potential malignant behavior. We report a case of endometriosis cyst occurred simultaneously in right side of orthotopic and accessory ovaries, together with torsion 180° of accessory ovarian cyst. Considering that the patient had not given birth and the large size of cysts, exploratory laparotomy was performed. During laparotomy, both site of ovarian cyst have been removed with orthotopic and accessory ovarian tissues preserved. After surgery, a large number of antral follicles were found both in right side of orthotopic and accessory ovaries by ultrasonography. Accessory ovary is considered to have physiological function, and can be preserved as a fertility protection measure for women who have fertility requirements. At present, the definition of ectopic ovary, accessory ovary and supernumerary ovary are very vague and rarely discussed separately. So, we proposed a new way to clarify the concepts of ectopic ovary, accessory ovary and supernumerary ovary. Moreover, we advocated that they should be discussed separately in terms of definition and management measures.
Keywords: accessory ovary; endometriosis; fertility preservation; torsion.
© 2020 Japan Society of Obstetrics and Gynecology.