A benign neoplasm that involves the endometrium. The disease is benign neoplasm of endometrium (MONDO_0021471, a Monarch Disease Ontology identifier). Also known as: benign endometrial neoplasm, benign endometrial tumor, benign endometrial tumour, benign endometrium neoplasm, benign endometrium tumor, benign endometrium tumour, benign neoplasm of the endometrium, benign tumor of endometrium.