Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again noted are bibasilar opacities , not significantly changed from the prior radiograph on ___ . At the right lung base , this appears to be due to a moderately - sized pleural effusion with adjacent atelectasis as seen on the CT abdomen / pelvis . However , underlying infection is difficult to exclude . There is no pneumothorax . Heart size is moderately enlarged .
    OUTPUT:
    
Mild vascular congestion Right lung base opacity appears to be due to a moderately - sized pleural effusion with adjacent atelectasis . Superimposed infection is difficult to exclude .