These are classified by the histology or cell make-up of the tumor. Surface epithelial-stromal tumor is the most common and includes serous tumour, endometrioid tumor and mucinous cystadenocarcinoma.
cord-stromal tumor comprise 8% of ovarian tumors and include granulosa cell, and sertoli leydig cell tumor. Germ cell
tumors, like teratoma
make up another 30%. Mixed tumors are another type.