An extra-large ovarian mucinous cystadenoma in a premenarchal girl and a review of the literature.

Objective: Epithelial ovarian neoplasms are extremely uncommon in children. Ovarian mucinous cystadenoma is benign and an extremely rare presentation in the premenarchal period. We present a case of giant mucinous cystadenoma of the left ovary in a 13-year-old and a review of the supporting literature.

Case Report: The patient was admitted with a history of increasing abdominal distension and pain for approximately 3 months and a history of an ovarian mass for 3 years. An adnexal mass measuring 40 × 30 × 20 cm was detected by abdominal ultrasonography and computed tomography. The tumor markers CEA, CA 19-9, and CA-125 were elevated, although α-fetoprotein and human chorionic antigen levels were within the normal range. The patient underwent surgery. The smooth-surfaced mass filled the abdomen. A frozen section biopsy was performed, and the results indicated a benign mucinous cystadenoma. A unilateral oophorectomy with tumor removal was performed.

Conclusion: The ovarian mass was revealed by abdominal distension, and a diagnosis was established by frozen biopsy. Complete and careful surgical resection provides satisfactory results; however, careful follow-up is required.