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 at the upper limits of normal size . The mediastinal and hilar contours are otherwise unremarkable . There is no pleural effusion or pneumothorax . The lungs appear clear . Mild degenerative changes are noted along the mid through lower thoracic spine . The bones appear probably demineralized .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .