Ovarian Mesonephric-Like Carcinosarcoma

**Semantic type:** Neoplastic Process

**Definition:** An exceedingly rare malignant neoplasm that arises from the ovary and is characterized by the presence of malignant glandular (adenocarcinoma) and mesenchymal (sarcomatous) components and displays mesonephric differentiation. Some tumors are thought to derive from mesonephric duct (Wolffian duct) remnants. Others may have a Mullerian duct lineage.