Mediastinoscopy.
D001706:Biopsy; D004724:Endoscopy; D006801:Humans; D008175:Lung Neoplasms / Q000175:diagnosis; D008198:Lymph Nodes / Q000473:pathology; D008207:Lymphatic Metastasis / Q000175:diagnosis; D008477:Mediastinal Diseases / Q000175:diagnosis; D008479:Mediastinal Neoplasms / Q000175:diagnosis; D008482:Mediastinum; D008722:Methods