Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior study , there has been increase in a moderate - to - large right pleural effusion . Linear opacities in the left lower lung are consistent with atelectasis . The lung apices are clear . The visualized portion of the heart is unremarkable . The imaged upper abdomen is unremarkable . A biliary catheter projects over the upper abdomen .
    OUTPUT:
    
Small increase in size of moderate - to - large right pleural effusion .