Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right ET tube is in the right mainstem bronchus terminating at the origin of the bronchus intermedius and should be withdrawn approximately 4 .5 cm . Mild interstitial pulmonary edema continues to improve . There is substantial left lower lobe atelectasis . There is no new focal airspace opacity to suggest pneumonia . The heart is not enlarged . The mediastinal and hilar contours are unchanged . Enteric tube terminates in the stomach .
    OUTPUT:
    
ET tube terminates in the right mainstem bronchus and should be withdrawn approximately 4 .5 cm . There is substantial left lower lobe atelectasis which may improve once the ET tube is repositioned .