Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest film ___ at 23 :57 is submitted
    OUTPUT:
    
There is persistent but improving interstitial and pulmonary edema in the setting of persistent low lung volumes . The heart remains enlarged and the mediastinal contours remain widened with particular prominence of the right hilar soft tissues which may be postoperative as this was not apparent on ___ study . Clinical correlation is recommended . Improving right lateral chest wall subcutaneous emphysema . No obvious pneumothorax .