Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest radiograph ___ at 14 : 12 is submitted .
    OUTPUT:
    
There has been interval removal of the right internal jugular Swan - Ganz catheter with the introducer sheath remaining in place . Interval placement of a left internal jugular Swan - Ganz catheter which has its tip in the right pulmonary artery . A nasogastric tube is seen coursing below the diaphragm with the tip not identified . No pneumothorax is seen . There continues to be perihilar fullness and pulmonary vascular indistinctness consistent with mild pulmonary edema . Overall , aeration has improved at the right base but the left basilar opacity is unchanged and likely reflects lower lobe atelectasis in the setting of a layering effusion . Status post median sternotomy with stable postoperative cardiac and mediastinal contours .