How conservative?
D001999:Bronchoscopy; D002283:Carcinoma, Bronchogenic / Q000601:surgery*; D004724:Endoscopy; D006801:Humans; D008175:Lung Neoplasms / Q000601:surgery*; D008197:Lymph Node Excision; D008207:Lymphatic Metastasis; D008479:Mediastinal Neoplasms