Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest film ___ at 02 : 12 is submitted .
    OUTPUT:
    
There is stable moderate layering bilateral effusions with associated airspace opacity likely reflecting partial lower lobe atelectasis , although bilateral pneumonia can not be excluded . There has been interval appearance of mild interstitial edema with increasing prominence of the upper vasculature . No pneumothorax . Status post median sternotomy with stable mediastinal contours . The cardiac contour is obscured by the pleural effusions .