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 mildly enlarged . The mediastinal and hilar contours are unremarkable . Hemidiaphragms are slightly flattened suggesting hyperinflation . There is no evidence for pleural effusion or pneumothorax . Mild degenerative changes are noted along the thoracic spine with slight anterior wedging of a lower thoracic vertebral body that appears slightly increased , perhaps sequelae of demineralization .
    OUTPUT:
    
No evidence of acute disease .