Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The endotracheal tube tip remains low , now all projecting at the level of the carina towards the right mainstem bronchus . No OG tube is identified on the current study . Lung volumes are lower , with slight worsening of pulmonary edema . The right lung is grossly clear . No pneumothorax .
    OUTPUT:
    
1 . The endotracheal tube remains low , projecting at the level of the carina , towards the right mainstem bronchus . It should be withdrawn for optimal placement . 2 . OG tube is not identified on the current study . 3 . Lower lung volumes .