Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal and hilar contours are stable . Widespread parenchymal opacities have slightly worsened since the most recent prior study , which again could reflect a combination of pulmonary edema and / or pneumonia superimposed on chronic interstitial lung disease . There is no pneumothorax .
    OUTPUT:
    
Interval slight worsening of pulmonary edema or pneumonia superimposed on chronic lung disease .