. Step 7 of 41
Clinical Stem 3
A patient with right upper lobe adenocarcinoma progressing on biomarker-directed therapy

The Case Continues
Because sonography was not available, a surgical consultation was obtained and mediastinoscopy was performed. Lymph nodes at station 4R and 4L were positive for adenocarcinoma. The patient's tumor was staged T2a N3 M0 (stage IIIB).