Fig. 3

A, The innominate vein was carefully dissected just above the right phrenic nerve. B, When dissect the thymus superior, keep the anatomical triangle of the Internal thoracic vein, Internal thoracic artery and Superior Vena Cava as far as possible, and conduct the grips to dissect the thymus superior through this area. C, The Left Internal thoracic vein was carefully dissected. D, Sweep the thymus and reduce misdamage in Brachiocephalic Trunk. E, The contralateral phrenic nerve was carefully dissected. F, Remove all of the pericardial surface fat