Figure 2. Photoimmunotherapy session and course of treatment. The mucosal surface of the target lesions was delineated and measured (① 7×7 mm, ② 9×12 mm) *Left inferior turbinate; **hard palate. B: The pointer of the Navigation System, confirming the direction of the deep lesion in the lateral pterygoid muscle. C: Puncturing by the needle catheter in the same direction as the pointer. D: Laser irradiation using a cylindrical diffuser. E: Laser irradiation using a frontal diffuser.