Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen are changes of median sternotomy and aortic valve replacement . Small bilateral pleural effusions persist , left greater than right . Increased pulmonary aeration , with mild residual left lower lobe atelectasis . Heart size is top normal .
    OUTPUT:
    
1 . Improved left lower lobe atelectasis . 2 . Persistent small pleural effusion .