Superior Mediastinal Nodes (1-4) * 1. Highest Mediastinal: above the left brachiocephalic vein. * 2. Upper Paratracheal: above the aortic arch, but below the left brachiocephalic vein. * 3. Pre-vascular or Pre-vertebral: these nodes are not adjacent to the trachea like the nodes in station 2. They are either anterior to the vessels (3A) or behind the esophagus, which is prevertebral (3P). * 4. Lower Paratracheal (including Azygos Nodes): below upper margin of aortic arch down to level of main bronchus. Aortic Nodes (5-6) * 5. Subaortic (A-P window): nodes lateral to ligamentum arteriosum. These nodes are not located between the aorta and the pulmonary trunk, but lateral to these vessels. * 6. Para-aortic (ascending aorta or phrenic): nodes lying anterior and lateral to the ascending aorta and the aortic arch. Inferior Mediastinal Nodes (7-9) * 7. Subcarinal. * 8. Paraesophageal (below carina). * 9. Pulmonary Ligament: nodes lying within the pulmonary ligaments. Hilar, Interlobar, Lobar, Segmental and Subsegmental Nodes (10-14) * 10-14: these are located outside of the mediastinum. They are all N1-nodes.