Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior exam , there has been significant interval worsening of pulmonary edema , which is now moderate to severe . There is no focal opacity to suggest pneumonia . There is no pleural effusion or pneumothorax . The mediastinal contours are normal . The heart size is at the upper limits of normal .
    OUTPUT:
    
Moderate to severe pulmonary edema has worsened since the prior examination .