Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval increase in moderate - to - severe pulmonary edema . Cardiac silhouette is enlarged . Mediastinal contours are stable . Given low lung volumes and lack of lateral views , it is difficult to exclude small pleural effusions . No pneumothorax .
    OUTPUT:
    
1 . Interval increase in marked pulmonary edema . 2 . Cardiomegaly .