Mesothelioma is a cancer that involves the mesothelium. The mesothelium is a thin membrane that lines the chest, heart, abdomen, and pelvic walls. Mesothelioma is a malignant cancer involving one or more of the mesothelium.
The mesothelium lining of the chest is called the pleura mesothelium. The mesothelium lining of the abdomen is referred to as the peritoneal mesothelium, and the lining surrounding the heart is called the pericardial mesothelium. For example, pleura mesothelioma involves the lungs.
The different types of mesothelioma are named for the area in which they occur in the body, however, it may also be classified according to how the cells look under a microscope. When classified by how the cells appear under a microscope, there are three different types; epitheloid, sarcomatoid or fibrous, and mixed type also known as biphasic.       Â
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