Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Sternotomy , MVR . Right IJ central line tip in the mid SVC . There is difference in patient positioning between the 2 exams . There is mild left pleural effusion , similar or mildly decreased . There is small right pleural effusion , worsened or more apparent . Bibasilar opacities , stable on the right , improved on the left , likely represent atelectasis . No pneumothorax . Small volume retrosternal air , in keeping with recent sternotomy . Heart is enlarged . Pulmonary vascularity at the upper limits are normal .
    OUTPUT:
    
Mild left , and small right pleural effusions . Bibasilar opacities , likely represent atelectasis .