Mesothelioma is a cancer that develops within the mesothelium of the body. The mesothelium is the protective covering in the body. It covers various organs, including the lungs. The mesothelium is made up of two thin layers. When cancer develops in the mesothelium it is between these layers. The narrow space makes it very difficult to diagnose mesothelioma in the early stages.
Mesothelioma is a difficult cancer to treat. Once a diagnosis of mesothelioma is made, the majority of patients will not live longer than eighteen months. There are a variety of reasons for this, including the advanced nature of the disease once it is diagnosed and the lack of an effective surgical method of removing the tumors.