Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and coronary bypass surgery . Stable postoperative appearance of cardiomediastinal contours . Interval worsening of bibasilar atelectasis . Persistent small pleural effusions with no visible pneumothorax .
    OUTPUT:
    
Worsening bibasilar atelectasis . Small bilateral effusions .