Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph was provided . A metallic stent is seen in the right upper quadrant , likely residing within the CBD . Bibasilar opacities are most compatible with atelectasis . No free air is seen below the right hemidiaphragm . Given the presence of lower lobe atelectasis , the possibility of a superimposed pneumonia is difficult to exclude . The cardiomediastinal silhouette is stable . No large effusion or pneumothorax is seen . Bony structures appear intact .
    OUTPUT:
    
Bibasilar opacities , most compatible with atelectasis . Please note , a superimposed subtle pneumonia is difficult to exclude . No signs of pneumoperitoneum . Stent visualized in the upper abdomen .