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Respiratory system


Definition:

Malignant mesothelioma is an uncommon cancerous tumor of the lining of the lung and chest cavity (pleura) or lining of the abdomen (peritoneum) that is typically due to long-term asbestos exposure.



Alternative Names:

Malignant mesothelioma



Causes, incidence, and risk factors:

Long-term exposure to asbestos -- a fire-resistant material -- is the biggest risk factor. Asbestos was once commonly found in insulation, ceiling and roofing vinyls, cement, and automotive brake materials. Although many asbestos workers smoked, experts do not believe smoking is a cause.

Malignant mesothelioma affects men more often than women. The average age at diagnosis is 60.

Cases of mesothelioma seem to be increasing worldwide.



Symptoms:

Symptoms may not appear until 20 - 50 years or longer after exposure to asbestos, and may include:



Signs and tests:

Mesotheliomas are often hard to diagnose under the microscope. It can be hard to distinguish between this type of tumor and other conditions and tumors of the pleura. More than one specialist may be involved in examining the biopsy. It may take some time for the diagnosis to be made.



Treatment:

There is no cure. Untreated, the average malignant mesothelioma patient survives 9 months. It is a difficult cancer to treat.

Often the disease is too advanced for surgery. Chemotherapy or radiation may be used to reduce symptoms. Combining certain chemotherapy drugs may help decrease symptoms and improve survival, but it will not cure the cancer.

Consider participating in a clinical trial (test of new treatments), which may give you more treatment options.

Pain relief, oxygen, and other supportive treatments may also help relieve symptoms.



Support Groups:

You can ease the stress of illness by joining a support group where members share common experiences and problems.

See:



Expectations (prognosis):

The average survival time varies from 4 - 18 months. However, your outlook depends on:

  • The stage of the tumor
  • Your age and general health
  • Whether surgery is an option


Complications:

The tumor can quickly spread to other organs.



Calling your health care provider:

Call for an appointment with your health care provider if you have symptoms of malignant mesothelioma.



Prevention:

Avoid exposure to asbestos.



References:

West SSD, Lee YCG. Management of malignant pleural mesothelioma. Clinics in Chest Medicine. 2006;27:335-354.

Camacho LH, Mora-Bowen A, Munden R, Smythe WR, Ordoñez NG. Malignant mesothelioma: natural history, pathologic features and future therapies. Am J Med. 2007;120:e7-9.

Mason RJ, Murray J, VC Broaddus, Nadel J. Textbook of Respiratory Medicine. 3rd ed. Philadelphia, Pa: WB Saunders; 2005:1994-2002.

Grainger RC, Allison D, Adam, Dixon AK. Diagnostic Radiology: A Textbook of Medical Imaging. 4th ed. Orlando, Fl: Churchill Livingstone; 2001:339-341; 514-515.




Review Date: 9/4/2008
Reviewed By: Sean O. Stitham, MD, private practice in Internal Medicine, Seattle, Washington; and James R. Mason, MD, Oncologist, Director, Blood and Marrow Transplantation Program and Stem Cell Processing Lab, Scripps Clinic, Torrey Pines, California. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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