Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are lucent and hyper inflated consistent with known COPD . Linear density at the left lung base most likely represents a focus of scarring . No signs of pneumonia or edema . The cardiomediastinal and hilar contours are stable . There is no pneumothorax or large pleural effusion . No free air below the right hemidiaphragm . Bony structures are intact .
    OUTPUT:
    
COPD without superimposed pneumonia or edema .