Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest film ___ at 08 :05 is submitted .
    OUTPUT:
    
Overall cardiac and mediastinal contours are stable . There are layering effusions , left greater right . More patchy retrocardiac opacity most likely reflects compressive atelectasis , although pneumonia or aspiration should also be considered . There is stable mild perihilar and interstitial edema . No pneumothorax .