Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest film ___ at 12 :33 is submitted .
    OUTPUT:
    
Right internal jugular introduing catheter remains in place . Overall stable postoperative cardiac and mediastinal contours in this patient status post median sternotomy for CABG . There is slightly improved aeration in the retrocardiac region but there is residual opacity with associated layering fluid suggestive of partial lower lobe atelectasis . Superimposed infection can not be entirely excluded . A smaller right effusion is likely present . The left - sided chest tube has been removed and there has been interval appearance of a small left apical pneumothorax .