What is mesothelioma?

Mesothelioma is cancer of the mesothelium.  This is a disease in which cells of the mesothelium become abnormal and divide without control or order.

They may invade and damage nearby tissues and organs. Cancer cells can also metastasize (spread) from their original site to other parts of the body. Most cases of mesothelioma begin in the pleura or peritoneum.

Working with asbestos is the major risk factor for mesothelioma. A history of asbestos exposure at work is reported in about 70 percent to 80 percent of all cases.

However, mesothelioma has been reported in some individuals without any known exposure to asbestos.