Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Vague right lower lobe opacity may be reflective of atelectasis although infection is not excluded . Elsewhere the lungs are clear . The cardiomediastinal silhouette is stable . Tortuosity of descending thoracic aorta is again noted . No acute osseous abnormalities .
    OUTPUT:
    
Right basilar opacity , potentially atelectasis given lower lung volumes although infection is certainly possible .