Mesothelioma is a type of cancer where the tumor grows on the mesothelium, which is a lining inside a body cavity. Pleural mesothelioma starts in a part of the chest called the pleura, which is the lining that surrounds the lungs and internal chest wall. It separates the lung from the chest wall. Pleural mesothelioma is different from lung cancer, which grows inside the lung. Pleural mesothelioma grows in the lining of the lung.

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