Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post sternotomy and presumably coronary artery bypass graft surgery . The cardiac , mediastinal and hilar contours appear unchanged . The heart is mildly enlarged . There is no pleural effusion or pneumothorax . The lungs appear clear . Bony structures appear unchanged with mildly exaggerated kyphotic curvature and small - to - moderate anterior osteophytes . There has been no significant change .
    OUTPUT:
    
No evidence of acute disease .