Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size and cardiomediastinal contours are normal . The lungs are severely hyperinflated with flattening of diaphragms , consistent with emphysema . Mild diffuse interstitial markings are likely reflective of chronic airways disease . No pleural effusion or pneumothorax .
    OUTPUT:
    
Severe hyperinflation compatible with emphysema . No pneumonia .