Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Sternotomy . Right IJ central line tip in the mid SVC heart is mildly enlarged , it is accentuated by shallow inspiration , and probably improved since ___ . Improved bibasilar opacities , likely from atelectasis . There is tiny left pleural effusion , improved . Right pleural effusion is no longer seen . There is tiny volume pneumomediastinum behind the xiphoid process , consistent with recent surgery . There is no pneumothorax . Normal pulmonary vascularity
    OUTPUT:
    
There is tiny left pleural effusion , improved . Improved bibasilar atelectasis . Tiny volume pneumomediastinum , consistent with recent surgery .