Another category of ovarian tumor is the sex cord-stromal tumors. These arise from supporting tissues within the ovary itself. As with germ cell tumors, these are uncommon. These cancers come from various types of cells within the ovary. They are much less common than the epithelial tumors. Stromal ovarian cancers (hormone-producing tumors) include granulosa-stromal tumors and Sertoli-Leydig cell tumors.
