Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . Moderate enlargement of the cardiac silhouette persists . The mediastinal and hilar contours are unchanged . Low lung volumes are present with crowding of the bronchovascular structures , but no overt pulmonary edema . Innumerable pulmonary metastases are re - demonstrated diffusely . Chain sutures are noted in the left lower lobe with adjacent scarring . Patchy left basilar opacity likely reflects atelectasis , but infection is not completely excluded . No new focal consolidation , pleural effusion or pneumothorax is seen . Multilevel degenerative changes are again seen noted within the thoracic spine .
    OUTPUT:
    
Low lung volumes with innumerable pulmonary metastases . Left basilar opacity , likely atelectasis , but infection can not be completely excluded .