Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were obtained . Linear opacities in the upper lungs are noted with associated retraction of the hila likely reflecting scarring in this patient with prior pneumonia . Subtle opacity in the left lower lobe retrocardiac region is of unclear etiology . No large effusion or pneumothorax . Old left lower rib fractures are noted .
    OUTPUT:
    
Areas of scarring in the upper lungs . Subtle opacity in left lower lobe . Please correlate with CT chest performed earlier same day for further details .