A primary or metastatic malignant neoplasm involving the ovary. Most primary malignant ovarian neoplasms are either carcinomas (serous, mucinous, or endometrioid adenocarcinomas) or malignant germ cell tumors. Metastatic malignant neoplasms to the ovary include carcinomas, lymphomas, and melanomas. The disease is MONDO_0008170 (ovarian cancer). Also known as: cancer of ovary, cancer of the ovary, malignant neoplasm of ovary, malignant neoplasm of the ovary, malignant ovarian neoplasm, malignant ovarian tumor, malignant ovarian tumour, malignant ovary neoplasm.