Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The hilar and mediastinal contours are within normal limits . Hyperinflation of the lungs and hyperlucency superiorly reflect severe emphysema . There is no evidence of pneumonia or heart failure , or pleural abnormality .
    OUTPUT:
    
Severe emphysema . No pneumonia or CHF .