A bone tumor arising from the remnants of the fetal notochord. This category includes the chordoma and benign notochordal cell tumor. The disease is notochordal tumor (MONDO_0002597, a Monarch Disease Ontology term). Also known as: cancer of notochord, malignant neoplasm of notochord, malignant notochord neoplasm, neoplasm of notochord, notochord cancer, notochord neoplasm, notochord tumor, notochord tumour.