Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . There is stable area of scarring at the left lung base . No new consolidation , effusion , or pneumothorax . Heart and mediastinal contours are normal . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Chronic scarring at the left lung base . No evidence of pneumonia .