A non-metastasizing neoplasm that arises from the ovary and is characterized by the presence of neoplastic epithelium that resembles the epithelium of the endocervix or gastrointestinal tract. It includes mucinous adenofibroma, mucinous cystadenofibroma, and mucinous cystadenoma. The disease is benign ovarian mucinous tumor (MONDO_0036915, a Monarch Disease Ontology id). Also known as: benign ovarian mucinous neoplasm, ovarian mucinous neoplasm, benign.