Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a moderate - to - large right pleural effusion , layering on today 's study given supine technique , likely not significantly changed compared to the prior radiograph from ___ . Moderate right and mild left lower lung atelectasis is noted . Mild - to - moderate cardiomegaly is not significantly changed . There is no pneumothorax . Note is made of midline sternotomy and CABG , as before . Old left rib fractures are noted .
    OUTPUT:
    
1 . Moderate - to - large right pleural effusion , likely not significantly changed allowing for differences in technique . 2 . Bibasilar atelectasis , right greater than left . 3 . Mild - to - moderate cardiomegaly , not significantly changed .