Mesothelioma is an uncommon form of cancer and the most serious of all diseases related to asbestos. Mesothelioma is a form of cancer in which malignant (cancerous) cells are found in the mesothelium, a protective sac that covers most of the body's internal organs. Though usually found in workers associated with the asbestos industry, both males and females of any age groups are prone to it. However, the risk is increased with age and occurs more in men.

Mesothelioma is a form of cancer where the mesothelium membrane cells divide abnormally. Mesothelioma usually begins in the pleura or peritoneum. From there, they spread quickly to other parts of the body.

The mesothelium tumors can be benign (noncancerous) or malignant (cancerous). A cancerous tumor of the mesothelium is called a malignant mesothelioma. Because most mesothelial tumors are cancerous, malignant mesothelioma is often simply called mesothelioma.

Malignant mesothelioma is divided into 3 main types: -

1. Epithelioid type

2. Sarcomata type

3. Biphasic/mixed type

Of these, the epithelioid type has the best prognosis. The treatment options for all three types are the same.