Stage IIIA lung cancer (1); drawing shows a primary tumor (5 cm or smaller) in the left lung (top inset) and cancer in lymph nodes around the trachea. Also shown is cancer that has spread to (a) the left main bronchus and (b) the membrane covering the lung (bottom inset). Also shown is (c) part or all of the lung has collapsed or has pneumonitis (inflammation). The carina, pleura, and a rib (bottom inset) are also shown.