A benign, borderline, or malignant epithelial tumor of the female reproductive system characterized by the presence of glands and/or cysts lined by neoplastic cells that resemble endometrial cells. The disease is Monarch Disease Ontology identifier MONDO_0002480 (endometrioid tumor). Also known as: endometrioid neoplasm, endometrioid neoplasm of female reproductive system, endometrioid neoplasm of the female reproductive system, endometrioid tumor (morphologic abnormality), endometrioid tumor of female reproductive system, endometrioid tumor of the female reproductive system, endometrioid tumour (morphologic abnormality), endometrioid tumour of female reproductive system.