ovarian endometrioid adenocarcinoma (MONDO_0006335) is an endometrioid adenocarcinoma arising from the ovary. It comprises 10% to 25% of all primary ovarian carcinomas. Grossly, endometrioid carcinoma may present as a cystic or solid mass. Microscopically, the tumor greatly resembles the appearance of the ordinary type of endometrial adenocarcinoma. As a group, endometrioid carcinoma has a prognosis twice as good as that of serous or mucinous carcinoma. Also known as: endometrioid adenocarcinoma of ovary, endometrioid adenocarcinoma of the ovary, endometrioid cancer of ovary, endometrioid cancer of the ovary, endometrioid carcinoma of ovary, endometrioid carcinoma of the ovary, endometrioid carcinoma ovary, endometrioid ovary carcinoma.