Fertility-sparing management of stage IIIC serous borderline ovarian tumor: A case report of a 20-year follow-up.

Multimodal treatment, including assisted reproductive technology, is necessary in young patients with advanced borderline ovarian tumors. However, the details of long-term follow-up cases have not been reported. In this report, a 19-year-old patient presented with a stage IIIC serous borderline tumor.