Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest radiograph ___ at 07 :33 is submitted .
    OUTPUT:
    
Right internal jugular Swan - Ganz catheter , endotracheal tube and nasogastric tube are unchanged in position . Status post median sternotomy with stable postoperative cardiac and mediastinal enlargement . Layering bilateral effusions with bibasilar patchy opacities likely representing lower lobe atelectasis . Prominent perihilar vasculature likely reflects combination of low lung volumes and residual perihilar edema . No pneumothorax .