Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The endotracheal tube ends 7 mm from the carina . There are low lung volumes and bibasilar opacities are again seen and unchanged , which may represent atelectasis given the lung volumes however pneumonia can not be ruled out . No pneumothorax . No large pleural effusion .
    OUTPUT:
    
ETT ends 7 mm from the carina , recommend pulling back . Bibasilar opacities are unchanged and may represent atelectasis due to low lung volumes however pneumonia can not be ruled out .