Region boundaries | Node groups[1,2] | Node group boundaries |
- Superior: Hyoid bone
- Lateral (neck): Medial border of carotid sheaths
- Lateral (chest): Mediastinal pleura
- Anterior: Sternum
- Posterior (medially): Great vessels, pericardium
- Posterior (laterally): Phrenic nerve
- Inferior: Xiphoid, diaphragm
| Low anterior cervical: Pretracheal, paratracheal, perithyroid, precricoid/Delphian (AAO-HNS/ASHNS Level 6/IASLC Level 1) | - Superior: Inferior border of cricoid
- Lateral: Common carotid arteries
- Inferior: Superior border of manubrium
|
Perithymic | |
Prevascular (IASLC Level 3a) | - Superior: Apex of chest
- Anterior: Posterior sternum
- Posterior: Anterior superior vena cava
- Inferior: Carina
|
Paraaortic, ascending aorta, superior phrenics (IASLC Level 6) | - Superior: Line tangential to superior border of aortic arch
- Inferior: Inferior border of aortic arch
|
Supradiaphragmatic/inferior phrenics/pericardial (along inferior poles of thymus) | - Superior: Inferior border of aortic arch
- Anterior: Posterior sternum
- Posterior: Phrenic nerve (laterally) or pericardium (medially)
- Inferior: Diaphragm
|