Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Postoperative appearance of cardiomediastinal contours is stable compared to the recent postoperative radiograph . Bibasilar atelectasis and small pleural effusions persist . Retrosternal lucencies on the lateral view or likely related to recent sternotomy .
    OUTPUT:
    
Bibasilar atelectasis and small pleural effusions .