Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is persistent changes of moderate pulmonary edema although slightly improved when compared the prior study with increased aeration particularly in the right upper and right lower lobes . The cardiomediastinal contour is unchanged , previous median sternotomy noted . No pneumothorax . There may be trace bilateral pleural effusions .
    OUTPUT:
    
Slight interval improvement in the pulmonary edema .