Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright chest radiograph ___ at 04 :29 is submitted .
    OUTPUT:
    
Endotracheal tube , left subclavian central line and nasogastric tube are unchanged in position . The side port of the nasogastric tube remains in the distal esophagus and advancement of this tube is recommended once again . Lung volumes remain low with minimal patchy opacity in the retrocardiac region favoring atelectasis rather than pneumonia . Clinical correlation is advised . No pulmonary edema . No pneumothorax . Overall cardiac and mediastinal contours are stable .