Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is marked hyperinflation of the lungs with flattened diaphragms consistent with known severe emphysema . An area of linear scarring in the right upper lung appears stable from prior exam . There is no definite sign of pneumonia or CHF . No large effusions or pneumothorax is seen . A metallic clip is again noted at the right lung apex . Bony structures are intact . Cardiomediastinal silhouette is stable .
    OUTPUT:
    
Severe emphysema without evidence of superimposed pneumonia .