Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . Lungs are hyperinflated with upper lobe lucency , likely reflective of underlying emphysema . Linear opacities in the lower lungs likely represent scarring . No large effusion or pneumothorax is seen . The cardiomediastinal silhouette appears stable . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
COPD without superimposed pneumonia .