Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Endotracheal tube tip ends in the right mainstem bronchus and should be pulled back approximately 3 .5 cm . A right port ends in the low SVC . There is no pneumothorax or large pleural effusion . Lung volumes are low . There is increased opacification of the left lung , which may reflect collapse secondary to right mainstem bronchus intubation or asymmetric edema .
    OUTPUT:
    
1 . Endotracheal tube tip ends in the proximal right mainstem bronchus and should be pulled back approximately 3 .5 cm . 2 . Increased opacification of the left hemithorax may represent asymmetric edema , aspiration , or collapse secondary to right mainstem bronchus intubation .