Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post coronary artery bypass graft surgery . The heart is mild to moderately enlarged , as before . The mediastinal and hilar contours appear stable . There is no pleural effusion or pneumothorax . The chest is hyperinflated . A band - like posterior opacity on the lateral view suggests atelectasis or scarring .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .