Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Lungs are hyperinflated consistent with severe emphysema . Streaky lower lung opacity is seen in the retrocardiac space likely scarring . No signs of pneumonia or edema . No large effusion or pneumothorax . Cardiomediastinal silhouette appears normal and unchanged . Bony structures are intact .
    OUTPUT:
    
COPD without superimposed pneumonia .