Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest was compared to previous exam from ___ . Small area of opacity identified at the right lung base medially . Elsewhere the lungs are clear . Single - lead pacing device is in stable position . Cardiac silhouette is stable . Osseous and soft tissue structures are unremarkable .
    OUTPUT:
    
Right basilar opacity medially , potentially due to atelectasis however developing infiltrate or other process is also possible . Two - view chest x-ray may help further characterize if desired .