Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest . There is a subtle right basilar opacity which was not been seen on most recent exam despite very similar positioning and technique . Elsewhere , the lungs are clear . The cardiomediastinal silhouette is stable noting cardiac enlargement and atherosclerotic calcifications of the aortic arch . No acute osseous abnormality did seen .
    OUTPUT:
    
Subtle right basilar opacity could represent infection in the proper clinical setting .