Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest radiograph ___ at 19 :42 is submitted .
    OUTPUT:
    
Left - sided pacer and right internal jugular Swan - Ganz catheter unchanged in position in this patient status post median sternotomy with mitral annular ring and CABG and stable expected postoperative appearance to the cardiac and mediastinal contours . Layering bilateral effusions with patchy bibasilar airspace opacities likely reflecting atelectasis . Interval improvement in mild pulmonary edema with crowding of the perihilar vasculature due to diminished lung volumes . No pneumothorax .