Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright chest radiograph ___ at 20 :45 is submitted .
    OUTPUT:
    
No pulmonary edema . Patchy bibasilar opacities are unchanged and may reflect atelectasis , although pneumonia can not be excluded . Minimal blunting the left costophrenic angle raises the possibility of a small effusion . No pneumothorax . Overall cardiac and mediastinal contours are stable . Interval removal of the right subclavian central line .