A malignant neoplasm involving the pericardium. The disease is Monarch Disease Ontology id MONDO_0001322 (pericardium cancer). Also known as: cancer of pericardium, malignant neoplasm of pericardium, malignant neoplasm of the pericardium, malignant pericardial neoplasm, malignant pericardial tumor, malignant pericardial tumour, malignant pericardium neoplasm, malignant tumor of pericardium.