Monarch Disease Ontology identifier MONDO_0003104 (epicardium cancer) is a malignant neoplasm involving the epicardium. Also known as: cancer of epicardium, malignant epicardial neoplasm, malignant epicardial tumor, malignant epicardial tumour, malignant epicardium neoplasm, malignant neoplasm of epicardium, malignant neoplasm of the epicardium, malignant tumor of epicardium.