Mesothelioma: Getting Treatment and Finding Help Mesothelioma is an uncommon form of cancer, usually associated with previous exposure to asbestos, which affects the pleura, a sac which surrounds the lungs, the peritoneum, the lining of the abdominal cavity, or the pericardium, a sac that surrounds the heart. Diagnosemesothelioma.info~Site InfoWhoisTrace RouteRBL Check