Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours are stable . There is probably mild hyperinflation suggested by flattening of hemidiaphragms . There is no pleural effusion or pneumothorax . The lungs appear clear . There is no free air . Bony structures are unremarkable .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease or free air .