Figure 10. Enhanced CT scan in a 73-year-old man with left lower lobe lung cancer (not shown) showing enlarged right lower paratracheal nodes (large arrow) lying medial to the azygos vein (V) and enlarged left lower paratracheal nodes (station 4L; open arrow) lying medial to ligamentum arteriosum (small arrows). Lower paratracheal nodes lie caudal to the top of the aortic arch. (From Sagel SS, Slone RM. Lung. In: Lee JKT, Sagel SS, Stanley RJ, Heiken JP, editors. Computed body tomography with MRI correlation, 3rd edn. Philadelphia, PA: Lippincott-Raven Publishers, 1998:351–454 [9]. Reprinted with permission).