Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Small right pleural effusion is mildly improved since ___ . Previously described right upper lobe opacity has cleared . Interstitial reticular opacities and bullae consistent with patient 's emphysema , unchanged . Bilateral apical scarring , more pronounced on R than left , unchanged . No pneumothorax . Cardiomediastinal borders and hilar structures are normal . Cardiac size is normal .
    OUTPUT:
    
Small right pleural effusion improved since ___ . Right upper lobe opacity previously described on ___ is cleared . Chronic interstitial changes consistent with emphysema .