The mesothelium is the lining that covers most of our internal organs. Mesothelioma is cancer of that lining, and it can take several different forms. One form is known as pleural cancer (cancer of the lungs
). It can also take the form of peritoneal cancer (lining of the abdomen), pericardial cancer (cancer of the heart). If you have been diagnosed with mesothelioma, it is more likely than not that you have been exposed to asbestos at some point in your life.