Figure 1: Surgery steps. All the incisions were bilaterally, but we made the incisions on one side to show the inside of the mouth in the pictures. A) First, an incision is made from A to A1. Then, an M to M1 incision will be made in the mouth. B) The muscle has been excised from the skin and mucosa and then back cut. C) B to B1 is the tumor site that has been removed, and B is sutured to B1 in the midline, resulting in a vertical suture line. The median of the dissected mucosa in the commissures sutured to the angle of incised skin from A to A1

Figure 2: Case 6. A) before surgery. B) in operation, the tumor is resected. C) Early post-operation. D) Post-operation year 2. E) Post-operation year 3