Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . Widespread lung opacification is very similar to the prior study , allowing for differences in technique and reflects known sarcoidosis . There is no pleural effusion or pneumothorax . The colon appears mildly distended at the hepatic flexure , but there is no free air identified .
    OUTPUT:
    
Stable pulmonary abnormalities . No evidence of free air .