Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of a right bronchial stent . The known large right perihilar mass is somewhat obscured by new opacifications in right mid-lung , possibly postsurgical in nature , although superimposed pneumonia can not be excluded . The lung volumes are low with increased mild bibasilar atelectasis . The heart is top - normal to mildly enlarged in size . No pneumothorax .
    OUTPUT:
    
1 . Interval placement of right bronchial stent . No pneumothorax . 2 . New opacifications in the right mid - lung obscures the known large right perihilar mass . This may be postsurgical in nature , however , superimposed pneumonia can not be excluded .