53 out of 70 patients (75.7%) used 3 trocars in the surgeries at the locations as follows: 1 x 10 mm trocar ở at the posterior axillary intercostal VIII-IX space for the camera, 1 x 10 mm trocar at middle axillary intercostal VI space and 1 x 5 mm trocar at the intercoastal IV cavity with middle axillary approach for surgical equipment.