Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An esophageal stent , new since prior study extends from the sternal notch to the level of the mid esophagus 4 cm below the carina . A right upper extremity PICC terminates in the upper SVC , as before . A left main stem bronchus stent appears to have migrated cranially since ___ with the proximal end now situated within the lower trachea 1 cm above the carina . Lungs are well inflated and clear . Cardiomediastinal silhouette and hilar contours are stable . There is no pleural effusion or pneumothorax . Visualized upper abdomen is unremarkable .
    OUTPUT:
    
1 . Interval placement of an esophageal stent extending from the sternal notch to the level of the mid esophagus 4 cm below the carina . 2 . Slight cranial migration of the left mainstem bronchus stent with the proximal end now situated in the lower trachea 1 cm above the carina .