Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Hilar engorgement is re - demonstrated with interval increase in interstitial markings since the prior study consistent with moderate pulmonary edema . More focal right base opacity may relate to fluid overload , but underlying infection is not excluded in the appropriate clinical setting . Very trace right pleural effusion is difficult to exclude . No pneumothorax is seen . Cardiac and mediastinal silhouettes are stable . Patient is status post median sternotomy and cardiac valve replacements .
    OUTPUT:
    
Moderate pulmonary edema . More focal right base opacity may relate to fluid overload , but infectious process is not excluded in the appropriate clinical setting .