Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post sternotomy and probably coronary artery bypass graft surgery . A three - lead pacemaker / ICD device has leads terminating in the right atrium , right ventricle , and coronary sinus , as before , without change . The heart is mildly enlarged . The mediastinal and hilar contours appear unchanged . The lungs appear clear . There are no pleural effusions or pneumothorax .
    OUTPUT:
    
No evidence of acute disease .