Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post prior median sternotomy . Interval decrease in the extent of the bilateral predominantly central confluent airspace opacities as well as the interstitial thickening . No pleural effusion or pneumothorax identified . The size of the cardiac silhouette is mildly enlarged but unchanged . Calcification of the aortic arch is noted .
    OUTPUT:
    
Interval decrease in the extent of the bilateral , predominantly central confluent airspace opacities and the peripheral interstitial thickening . No new focal consolidations identified .