Figure 4. Adenocarcinoma of the right upper and middle lobes in a 35-year-old man. CT scan obtained at the level of the aortopulmonary window shows enhancing low right paratracheal nodes (ATS station 4R) (arrowhead), subaortic nodes (ATS station 5) (straight arrows), and low left (contralateral) paratracheal nodes (ATS station 4L) (curved arrow). The subaortic nodes contained tumor tissue at anterior parasternal mediastinotomy. Therefore, the patient has N3 disease, which is inoperable. * = adenocarcinoma.