[Displaced B1+2 Found at Video Assisted Thoracic Surgery for Lung Cancer of Left Upper Lobe].

We report the case of an 83-year-old woman who presented with an abnormal pulmonary nodule suspected to be lung cancer in the left S3 segment. Bronchoscopy showed that the left main bronchus branched off into the B1+2, B3 plus lingular bronchus, and lower bronchus. Video-assisted thoracic surgery was performed, and the nodule was pathologically diagnosed as a primary lung cancer. Subsequently, left upper lobectomy was performed, and an abnormal bronchus was observed behind the main pulmonary artery. Intraoperative bronchoscopy indicated that the bronchus was the displaced B1+2. The B3 plus lingular bronchus existed at the common place of the upper bronchus. The displaced B1+2 and the other upper bronchus were transected separately. No other abnormalities were observed in the pulmonary arteries, veins, or bronchi. Preoperative examination is the best way to detect this bronchial abnormality;identification with intraoperative bronchoscopy can play a crucial role in determining the perioperative strategy.