A neoplasm of low malignant potential arising from the ovary. It is characterized by the presence of glandular or cystic spaces which contain atypical glandular epithelial cells resembling endometrial cells. The surrounding ovarian stroma is often fibrotic. There is no evidence of stromal invasion. The disease is Experimental Factor Ontology id EFO_1000137 (Borderline Ovarian Endometrioid Tumor).