What are indications for mediastinoscopy?

• Staging of lung cancer: - suspicion of N3 (contra-indication to resection), - search for N2 (induction chemotherapy before resection), - suspicion of small cell lung carcinoma(contra-indication for surgery). • Typing of tumors: - lung cancer: if bronchoscopy is non contributive, - mediastinal tumors: histological typing (lymphoma, thyroid goiter or neoplasm, etc). • Diagnosis of inflammatory diseases: sarcoidosis (biopsy of mediastinal lymph nodes)