Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been a slight interval increase in interstitial opacities involving the lower lobes . Upper lobe scarring with superior retraction of the hila are similar to prior . No new focal consolidation , pleural effusion , pneumothorax . The heart size and cardiomediastinal contours are stable .
    OUTPUT:
    
Slight interval increase in lower lobe interstitial opacities which may represent progression of sarcoid and would be better characterized on chest HRCT . Otherwise stable appearance of changes related to sarcoid . No focal consolidation .