Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . There is moderate cardiomegaly . Widened mediastinum has improved . Vascular congestion has resolved . Small bilateral effusion with adjacent atelectasis have improved . Sternal wires are aligned . Patient is status post CABG . There is minimal pneumopericardium .
    OUTPUT:
    
Small bilateral effusions .