Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post coronary artery bypass graft surgery . The cardiac , mediastinal and hilar contours appear stable . The chest is hyperinflated . There is no pleural effusion or pneumothorax . The lungs appear clear . Nipple shadows are again visible bilaterally .
    OUTPUT:
    
No evidence of acute disease .