Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest film ___ at 16 : 25 is submitted .
    OUTPUT:
    
Right internal jugular central line has its tip in the distal SVC . Interval extubation and removal of the nasogastric tube , mediastinal drains , and left chest tube . No pneumothorax is seen . Status post median sternotomy with expected postoperative cardiac and mediastinal contours . Lung volumes are low with patchy bibasilar opacities suggestive of atelectasis . Probable small left effusion .