Unidirectionally progressive resection of lower left lung carcinoma under video-associated thoracoscopy

General anesthesia is adopted through double-lumen endotracheal intubation, one-lung ventilation on the contralateral, and intravenous injection. The patient took a 90 degree decubitus on his contralateral side. The operative incisions: the observation port was made in the mid-axillary line of the 7^th intercostal section, a second horizontal incision of 4 cm as the main operation port at the 4^th intercostal space between the anterior axillary line and the midclavicular line, and a 3^rd incision of 1.5 cm as the secondary operation hole at the 9^th intercostal space between the axillary line and the bottom scapular line. The surgeons were on the ventral side of the patient, and operated with endoscope apparatus in front of the monitor screen.