A malignant neoplasm of the pleura or peritoneum, arising from mesothelial cells. It is associated with exposure to asbestos. The disease is malignant mesothelioma (MONDO_0006292). Also known as: malignant mesothelial tumor, malignant mesothelial tumour, malignant mesothelioma (disease), malignant neoplasm of mesothelium, malignant neoplasm of the mesothelium, malignant tumor of mesothelium, malignant tumor of the mesothelium, malignant tumour of mesothelium.