Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest radiograph ___ at 12 :41 is submitted .
    OUTPUT:
    
Endotracheal tube , right internal jugular Swan - Ganz catheter , left basilar chest tube , mediastinal drains , and nasogastric tube are unchanged in position . Stable postoperative cardiac and mediastinal contours status post median sternotomy with aortic valve replacement . Interval decrease in pulmonary edema with residual mild edema . Persistent retrocardiac opacity which may reflect lower lobe atelectasis in the setting of a layering effusion . No obvious pneumothorax .