station 4L is bordered by aortic arch and left pulmonary artery


  • upper border: aortic arch (yellow)
  • lower border: pulmonary artery (blue)
  • medial border: left margin of trachea

EBUS

  • on EBUS, navigate to right above carina or immediately in the left main bronchus and look at 10-12 o'clock
  • as you come up, look for intersection between pulmonary artery and aorta
  • PA will be to the left on screen (inferior) and aorta on the right