Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest film ___ 04 : 19 is submitted .
    OUTPUT:
    
Interval appearance of layering bilateral effusions and bibasilar airspace opacities suggestive of compressive atelectasis , although aspiration or pneumonia should also be considered . Status post median sternotomy for CABG . Right internal jugular central line and nasogastric tube are likely unchanged in position . No pulmonary edema . No pneumothorax .