MONDO_0002229 (ovarian epithelial tumor) is a benign, borderline, or malignant tumor that originates from the surface epithelium of the ovary. It is composed of epithelial cells and stroma. Representative examples of benign tumors include serous cystadenoma, mucinous cystadenoma, and benign Brenner tumor. Representative examples of borderline tumors include serous surface papillary tumor, mucinous adenofibroma, and borderline Brenner tumor. Representative examples of malignant tumors include serous adenocarcinoma, mucinous adenocarcinoma, endometrioid adenocarcinoma, and malignant Brenner tumor. Also known as: epithelial neoplasm of ovary, epithelial neoplasm of the ovary, epithelial tumor of ovary, epithelial tumor of the ovary, epithelial tumour of ovary, epithelial tumour of the ovary, ovarian surface epithelial-stromal tumor, ovarian surface epithelial-stromal tumour.