Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Post CABG changes . The cardiomediastinal shadow is unchanged . Bilateral pleural effusions which show slight interval progression . No pulmonary edema . No airspace consolidation . No pneumothorax .
    OUTPUT:
    
Mild interval increase in the size of the bilateral pleural effusions . Post pericardiotomy syndrome should be excluded .