When the cancer is in the chest, it affects the pleura or tissue lining the lungs and is called malignant pleural mesothelioma. This is the most common type of mesothelioma. In the abdomen, a cancer of the peritoneum or tissue lining the abdominal cavity and covering various organs is called malignant peritoneal mesothelioma. The least common form of mesothelioma affects the pericardium, or outer lining of the heart. The term mesothelioma literally means a growth of the mesothelium, a layer of tissue from which the pleura, peritoneum and pericardium all develop.The majority of malignant mesotheliomas occur in people who have been exposed to asbestos, either directly or via people they live with. Avoiding exposure to asbestos can largely prevent malignant mesotheliomas. Depending on the location of the cancer, someone with malignant mesothelioma may have one or more of the following symptoms: breathlessness, pain under the rib cage or in the abdomen, an abdominal lump or swelling, and unexplained weight loss.
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