What are ovarian tumors?

➢ Tumors of the ovary are remarkably varied as they may arise from any of the three cell types in the normal ovary: the multipotent surface (coelomic) epithelium, the totipotent germ cells, and the sex cord–stromal cells. ➢ Neoplasms of epithelial origin account for the great majority of ovarian tumors and, in their malignant forms, account for almost 90% of ovarian cancers ➢ Germ cell and sex cord–stromal cell tumors are much less frequent; although they constitute 20% to 30% of ovarian tumors, they are collectively responsible for less than 10% of malignant tumors of the ovary.