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Fig. 5B —65-year-old man with small cell lung carcinoma and superior vena cava syndrome. Contrast-enhanced CT scan (A) and same scan with nodes colored (B) show station 4 lower paratracheal nodes (bright orange, B). Station 4 lower paratracheal nodes can be separated into superior and inferior subsets. Nodes shown are in superior subset, meaning they are inferior to top of aortic arch and above azygos vein. Along with other mediastinal nodes, these station 4 superior lower paratracheal nodes can be separated into those to right (4R) (curved arrow) or left (4L) (straight thick arrow) of midline, as seen in Figures 1B and 1D, Midline nodes (thin arrow) are considered to be on same side as primary lung tumor. Therefore, in this patient with right lower lobe mass, midline nodes anterior to trachea are categorized as station 4 superior lower paratracheal nodes. Enhancing chest wall venous collaterals are again shown.

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