Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . The lungs appear hyperinflated , though clear without focal consolidation , effusion or pneumothorax . The upper lobe lucency with widened AP diameter of the chest is compatible with a known underlying emphysema . Cardiomediastinal silhouette is stable . No effusion or pneumothorax is seen . Bony structures are intact .
    OUTPUT:
    
Emphysema without superimposed acute process .