Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest film ___ at 18 :38 is submitted .
    OUTPUT:
    
There are bilateral layering effusions , right greater than left , which may not be significantly changed given differences in positioning . Bibasilar opacities , left greater than right , likely reflect partial lower lobe compressive atelectasis , although superimposed infection can not be excluded . There has been interval appearance of mild interstitial edema . Overall cardiac and mediastinal contours are stable . No pneumothorax .