Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A moderate sized right pleural effusion appears relatively unchanged compared to the prior exam . Right basilar opacity may reflect atelectasis though infection can not be excluded . Left lung base is not imaged in its entirety , but where seen , there is likely a retrocardiac opacity which may reflect atelectasis or infection . The pulmonary vascularity is not engorged . Tortuosity of the thoracic aorta is again demonstrated with associated calcifications . No pneumothorax is identified , and no large left pleural effusion is present .
    OUTPUT:
    
Persistent moderate size right pleural effusion . Bibasilar airspace opacities may reflect atelectasis though infection can not be excluded .