Definition:epithelial ovarian cancer (eh-pih-THEE-lee-ul oh-VAYR-ee-un KAN-ser)
Cancer that forms in the tissue covering the ovary (one of a pair of female reproductive glands in which eggs are made). Most ovarian cancers are epithelial ovarian cancers. Fallopian tube cancer and primary peritoneal cancer are similar to epithelial ovarian cancer and are staged and treated the same way. Also called ovarian epithelial cancer.