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 again mild to moderately enlarged . There is mild unfolding of the thoracic aorta . The arch is again calcified . The cardiac , mediastinal and hilar contours appear unchanged . The lungs appear clear . There are no pleural effusions or pneumothorax . Mild degenerative changes are noted along the lower thoracic and upper lumbar spines . There has been no significant change .
    OUTPUT:
    
No evidence of acute disease .