Mesothelioma is a rare form of cancer that affects the sac lining the chest (the pleura), the lining around the heart (the pericardium), or the lining of the abdominal cavity (the peritoneum). Studies have shown that people, who suffer from the disease mesothelioma, were exposed to an abundance of asbestos at one time or another in their life. Unfortunately, many people become exposed to asbestos unknowingly, usually as part of a job. Because of this, someone who has mesothelioma is often entitl.