Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest film ___ at 12 :23 is submitted .
    OUTPUT:
    
There is persistent but improving mild pulmonary and interstitial edema . There is small layering effusions , left greater than right . Overall cardiac and mediastinal contours are stable in this patient status post median sternotomy . No pneumothorax .