Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Diffuse bilateral widespread parenchymal opacities is secondary to severe background interstitial lung disease . There is mild pulmonary vascular congestion as well as mild pulmonary edema . There is no evidence pneumothorax . The visualized osseous structures are unremarkable .
    OUTPUT:
    
Mild pulmonary vascular congestion as well mild pulmonary edema , on a background of chronic interstitial lung disease . Superimposed infection can not be excluded .