Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . Large right perihilar mass is again seen and not significantly changed . More extensive streaky right basilar opacities are seen which may be due to atelectasis , especially given relative elevation of the right hemidiaphragm perhaps slightly more so than on prior . Tracheal stent is identified . The left lung is grossly clear . The cardiomediastinal silhouette is unchanged . No acute osseous abnormalities .
    OUTPUT:
    
Large right perihilar mass as on prior . Linear right basilar opacities , most suggestive of atelectasis .