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; malignant tumor of the pericardium; malignant tumour of pericardium; malignant tumour of the pericardium