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==[[keyword:=What Is Mesothelioma|What Is Mesothelioma?]]==

==[[keyword:=What Is Mesothelioma|What Is Mesothelioma?]]==

[[Image:Mesothelioma lung.jpg|right|200px|A lung ravaged by mesothelioma.]]

[[Image:Mesothelioma lung.jpg|thumb|right|200px|A lung ravaged by mesothelioma.]]

'''Mesothelioma''' is a form of cancer that is almost always caused by previous exposure to asbestos.<ref name="dhs">United States Department of Health and Human Services.</ref> In this disease, malignant cells develop in the mesothelium, a protective lining that covers most of the body's internal organs. Its most common site is the pleura (outer lining of the lungs and chest cavity), but it may also occur in the peritoneum (the lining of the abdominal cavity) or the pericardium (a sac that surrounds the heart).<p>

'''Mesothelioma''' is a form of cancer that is almost always caused by previous exposure to asbestos.<ref name="dhs">United States Department of Health and Human Services.</ref> In this disease, malignant cells develop in the mesothelium, a protective lining that covers most of the body's internal organs. Its most common site is the pleura (outer lining of the lungs and chest cavity), but it may also occur in the peritoneum (the lining of the abdominal cavity) or the pericardium (a sac that surrounds the heart).<p>