What is mesothelioma?
Mesothelioma is a form of cancer that develops in the protective lining of the chest cavity, abdominal cavity and the cavity around the heart. Since most mesothelial tumors are cancerous, malignant mesothelioma is simply called mesothelioma. The most common site for these tumors to develop is the pleura (outer lining of the lungs and internal chest wall). Mesothelioma can also occur in the peritoneum (the lining of the abdominal cavity) and in the sac surrounding the heart (pericardium).
