Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Bilateral upper displacement of the hila appears unchanged , consistent with upper lobe volume loss . Bilateral upper lobe reticular and nodular opacities appear similar to the prior study . No new areas of consolidation are identified within the lungs , and there are no pleural effusions .
    OUTPUT:
    
Chronic upper lobe interstitial abnormality with associated volume loss . No radiographic evidence of acute pneumonia .