Cancer (1) is found in one side of the chest in the lining of the chest wall. Cancer may have spread to the lining of the chest cavity between the lungs; the lining that covers the diaphragm; the lining that covers the lung; the diaphragm muscle; or the lung. Cancer has spread to lymph nodes where the lung joins the bronchus, along the trachea and esophagus, between the lung and diaphragm, or below the trachea; or (2) is found in one side of the chest in the lining of the chest wall; the lining of the chest cavity between the lungs; the lining that covers the diaphragm; and the lining that covers the lung. Cancer has spread into one or more of the following: tissue between the ribs and the lining of the chest wall; fat in the cavity between the lungs; soft tissues of the chest wall; and/or sac that covers the heart. Cancer may have spread to lymph nodes where the lung joins the bronchus, along the trachea and esophagus, between the lung and diaphragm, or below the trachea.