Mesothelioma is cancer of the mesothelium.
In this cancer, the mesothelial cells begin to divide abnormally without control. Since mesothelium covers most the internal organs, the cancer rapidly spreads to cover these organs. Cancer cells also spread away from the area of origin to other parts of the body via blood stream. Most cases of mesothelioma begin in the pleura or peritoneum.
Mesothelioma is highly aggressive cancer that rapidly spreads and is fatal soon after it is diagnosed. Fortunately, it is relatively rare as compared to many other cancers such as cancer of colon, breast or prostate. Mounting attention has been paid to this tumor in the past few years because of its increased risk among people with heavy exposure to asbestos.