Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to prior , there is no significant change . The cardiomediastinal silhouette is unchanged . The lungs are clear . No pleural abnormality is seen . Previously seen 1 .4 cm opacity in the right base is not well appreciated on this exam .
    OUTPUT:
    
Right basal opacity is not seen on this exam .