Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the CT scan obtained she 9 days prior , there has been interval removal of a left mainstem bronchus stent with subsequent left upper lobe atelectasis , leftward mediastinal shift , and elevation of the left hemidiaphragm . An ET tube terminates 3 cm above the carina . The right lung is fully expanded and clear . No pleural effusions . No pneumothorax . Heart size is normal . A left - sided port terminates near the superior cavoatrial junction .
    OUTPUT:
    
Interval removal of a left mainstem bronchus stent with subsequent substantial left upper lobe atelectasis . No pneumothorax .