Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Coarse interstitial opacities in the upper lobes bilaterally are indicative of underlying fibrotic changes secondary to chronic sarcoid . Comparing to prior studies there is no new focal consolidation to suggest pneumonia . No pleural effusion or pneumothorax . No evidence of pulmonary edema . Heart size and mediastinal contours are within normal limits .
    OUTPUT:
    
Chronic interstitial changes in the upper lobes bilaterally compatible with chronic sarcoid , but no evidence of new consolidation to suggest pneumonia .