Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . The lungs are hyperinflated with upper lobe lucency compatible with known underlying emphysema . There is no focal consolidation , effusion , pneumothorax . No signs of CHF . Cardiomediastinal silhouette is stable . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Emphysema without superimposed pneumonia .