Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright chest radiograph ___ at 18 : 10 is submitted
    OUTPUT:
    
Nasogastric tube has its tip projecting over the stomach in satisfactory position . Lung volumes remain low with patchy bibasilar opacities which could reflect atelectasis and at least a small right layering effusion . A superimposed infectious process can not be entirely excluded . No pulmonary edema . Cardiac and mediastinal contours are unchanged . No pneumothorax .