Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable supine chest film ___ at 14 : 18 is submitted .
    OUTPUT:
    
Interval removal of the left chest tube with no pneumothorax appreciated ; however , the sensitivity to detect pneumothorax is diminished given supine technique . If this remains of clinical concern , followup imaging in the upright or decubitus position would be advised . Endotracheal tube , right internal jugular introducer , and right internal jugular Swan - Ganz catheter are unchanged in position . Nasogastric tube courses below the diaphragm with the tip not identified . Overall cardiac and mediastinal contours are stable status post median sternotomy with valve replacement . Lungs appear grossly clear . No overt pulmonary edema .