station 4R is bordered by SVC, azygos, and trachea
- related: Chest lymph nodes and where to find them
- tags: #permanent
- anterior border: SVC
- posterior and medial border: trachea
- lower border: azygos
- distinguishing 4R and 10R is important for staging (azygos vein and pulmonary artery distinguish hilar and mediastinal lymph nodes)
EBUS
- on EBUS, navigate to right above carina or immediately in right mainstem and look 1-2 o'clock
- slowly come up and pan from 11-3 o'clock as you do
- SVC will appear below 4R (farther away from scope)
- azygos will appear to left of 4R (left is inferior)