Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Known to have emphysema with more fibrotic change at the right lung base anteriorly as seen on prior CT . There is no evidence of a superimposed pneumonia , effusion or pneumothorax . The heart and mediastinal contour is normal . The bony structures are intact .
    OUTPUT:
    
Emphysema without superimposed pneumonia .