• Siew Fei Ngu, Hei Lok Tiffany Wan, Y S Tam, and Vincent Y T Cheung.
• Department of Obstetrics and Gynaecology, Queen Mary Hospital, The University of Hong Kong, Hong Kong Special Administrative Region. ngusiewf@hku.hk
• Obstet Gynecol. 2011 Feb 1; 117 (2 Pt 2): 477-8.

BackgroundAn accessory ovary is a rare congenital anomaly of the female reproductive tract. This report illustrates a case of a cyst arising from an accessory ovary complicated by torsion.CaseA 39-year-old nulliparous woman presented with lower abdominal pain and was found on physical examination to have an 8-cm mass anterior to the uterus. Ultrasonography of the pelvis showed a 9.3×6.7 cm cystic lesion with a solid component anterior to the uterus suggestive of a left ovarian cyst. Laparoscopy was performed for presumed ovarian torsion. Torsion of a tumor arising from an accessory ovary was found intraoperatively.ConclusionPatients suspected to have ovarian torsion should have emergency surgery for diagnosis and attempted ovarian preservation. Physicians should consider complications of paraovarian anomalies in the differential diagnosis.

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