Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest on ___ at 747 is submitted .
    OUTPUT:
    
There has been interval increase in the subcutaneous emphysema involving the right lateral chest wall and neck soft tissues . A right chest tube remains in place . There are stable postoperative changes in the right hemithorax with associated volume loss . No pneumothorax is appreciated . Left lung is grossly clear . Overall cardiac and mediastinal contours are unchanged . No pulmonary edema . A tiny lucency projecting beneath the right hemidiaphragm may represent pneumoperitoneum . This should be assessed on followup imaging .