A 36 years old man was scheduled for carinal resction, left pneumonectomy, and tracheobronchial anastomosis under the diagncais of malignant tumor in the carina and left main bronchus. During the procedure of carinal resection, anesthesia had been maintained with a right bronchial tube which was intubated through operating thoracic cavity. The E.K.G. was monitored continuously and a radial artery canula was inserted for disect arterial pressure monitoring and blood gas analysis sampling. Anesthetic course was uneventful with nitrous oxide, ahlothane and pancuronium under controlled respiration. Postoperative course had minor problem with right upper lobe atelectasis which disappeared soon after tracheal suction.