Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval progression of bilateral parenchymal opacities , either representing significant worsening of pneumonia or development of air DS . Left central venous line and enteric tube are unchanged in position . Bilateral pleural effusions are again seen .
    OUTPUT:
    
Progression of parenchymal disease , either worsening pneumonia or development of ARDS .