Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy , and multiple surgical clips likely reflect prior bypass surgery . There is mild pulmonary vascular congestion and interstitial edema , slightly improved from prior exam . The right lung base opacity is again noted which could reflect asymmetric edema or pneumonia . The heart is top - normal in size , and calcifications of the aortic arch are again seen . No pneumothorax is seen , and there are small bilateral pleural effusions , smaller since prior .
    OUTPUT:
    
1 . Mild pulmonary vascular congestion and interstitial edema . Right lung base opacity could reflect asymmetric edema or possible pneumonia . 2 . Small bilateral pleural effusions .