Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Postoperative appearance of cardiomediastinal contours is stable in this patient status post recent median sternotomy and aortic surgery . Moderate to large left pleural effusion and small right pleural effusion are apparently slightly increased in size in the interval although positional differences limit comparison .
    OUTPUT:
    
Moderate to large left and small right pleural effusions with adjacent bibasilar atelectasis .