What is Mesothelioma? What is the difference between pleural mesothelioma and peritoneal mesothelioma?
Malignant mesothelioma is a disease in which a cancerous tumor grows on the mesothelium - the sac lining the internal body cavities. The specific type of mesothelioma is named for the tissue where the cancer started. Pleural mesothelioma starts in the chest, in the pleura that surrounds the lungs (outer lining of the lungs and internal chest wall). It makes up about 70% of mesothelioma cases. Peritoneal mesothelioma starts in the lining of the abdominal cavity.

pleural cavity

Although sometimes referred to as "asbestos lung cancer", mesothelioma is not the same as lung cancer. Lung cancers occur inside the lung itself; mesothelioma occurs in the lining of the lung. Mesothelioma is rare, striking fewer than 3000 Americans per year.

What happens inside the body?
The cancerous cells clump together in a malignant tumor. As it grows, the tumor pushes against and into other organs and healthy tissue, causing symptoms. Because the mesothelium is a flat thin lining, the mesothelioma tumor often takes a diffuse shape.

In its advanced stage the cancer metastasizes through the lymph system and spreads to other parts of the body. It is still referred to as mesothelioma because it started in the mesothelium.

What are the symptoms of mesothelioma?
Our mesothelioma symptoms page goes into detail about the signs of this cancer. It is important to seek professional medical advice when trying to diagnose for mesothelioma because the symptoms can be confused with symptoms of other diseases.

Major symptoms of pleural mesothelioma include:

* Shortness of breath caused by expanding pleural effusion
* Persistent dry cough
* Chest pain

Major symptoms of peritoneal mesothelioma include:

* Ascites (fluid in the abdomen)
* Swelling or lumps in the abdomen
* Abdominal pain

Some patients experience few of the visible symptoms. Formal diagnostic procedures are needed to determine if the cancer is present.

How do you get malignant mesothelioma?
Mesothelioma is caused by asbestos exposure. Asbestos, once regarded as a miracle mineral, was popular due its lightweight but tough characteristics as well as for its heat-resistant properties. This naturally occurring mineral was used in many commercial and consumer products, from construction materials such as cement, roofing shingles and insulation, to consumer and industrial applications such as hair dryers, automobile brake pads and pipe insulation.
Anatomy of the Lung Mesothelioma and how it effects the lung

Most people with malignant mesothelioma worked on jobs where they breathed asbestos. Others were exposed to asbestos in a household environment, often without knowing it.

How much exposure does it take to get the disease? What is the latency period?
Very little exposure can result in mesothelioma. Sometimes people who worked with asbestos for as little as one or two months get mesothelioma. The "latency period" refers to the time between asbestos exposure and diagnosis of the disease. For mesothelioma, the latency period can be decades long, and people exposed in the 1940s, 50s, 60s, and 70s are now being diagnosed.

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