A non-metastasizing neoplasm that arises from the ovary and is characterized by the presence of glands or cysts lined by benign endometrial-type cells. It includes endometrioid adenofibroma, endometrioid cystadenofibroma, and endometrioid cystadenoma. The disease is Experimental Factor Ontology identifier EFO_1000113 (Benign Ovarian Endometrioid Tumor).