RESULTS: All of them recovered from dyspnea immediately thereafter and none of them developed postoperative complications. We histopathologically confirmed that the obstructions comprised adenoid cystic carcinoma (n = 12), squamous cell carcinoma (n = 5) and others (n = 4). As a definitive treatment, 7 patients received chemoradiotherapy, 6 patients received radiotherapy, and 6 patients received operations after the estimation of tumor staging. The radical operative procedures were left sleeve pneumonectomy and tracheal resection in one and four patients, respectively. Two elderly patients declined the preceding treatment.