ABSTRACT
We report a case of osseous metaplasia in borderline serous papillary cystadenofibroma of the ovary. Serous tumors of the ovary are common cystic neoplasms. In some serous neoplasms, the fibroblastic stromal component is unduly prominent, appearing grossly as solid, white nodular foci in a cystic neoplasm. These serous neoplasms is classified as cystadenofibroma and can be separated into benign, borderline and malignant types. The borderline category of this neoplasm extremely rare. The occurrence of osseous metaplasia within an ovarian papillary serous cystadenofibroma is very rare. So far only two cases of osseous metaplasia associated with a serous cystadenocarcinoma of the ovary1 have been reported. The present report is, therefore, a first case of osseous metaplasia in an ovarian borderline serous papillary cystadenofibroma