part_of part of part of has_disease_location ovarian neoplasm ovary Benign Ovarian Surface Epithelial-Stromal Tumor NCIt:C4510 A non-metastasizing neoplasm that originates from the surface epithelium of the ovary. It is composed of epithelial cells and stroma. Representative examples include serous cystadenoma, mucinous cystadenoma, clear cell adenofibroma, and benign Brenner tumor.