A rare malignant germ cell tumor that arises from the pericardium. The disease is malignant cardiac germ cell tumor (Monarch Disease Ontology id MONDO_0001991). Also known as: malignant Cardiac germ cell neoplasm, malignant Cardiac germ cell tumor, malignant Cardiac germ cell tumour, malignant germ cell neoplasm of heart, malignant germ cell neoplasm of the heart, malignant germ cell tumor of heart, malignant germ cell tumor of the heart, malignant germ cell tumour of heart.