Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The ET tube is located in the right mainstem bronchus and could be pulled back 4 cm . The left lung is still ventilated . Otherwise the pleural effusions , bibasilar atelectasis and cardiomegaly are stable in appearance . No pneumothorax .
    OUTPUT:
    
ET tube is located in the right mainstem bronchus which could be pulled back 4 cm .