Fig. 16. Vidian neurectomy diagram. (A) The area of incision and anatomical surroundings of interest in endoscopic vidian neurectomy. Yellow curved line indicates an incision; the oval, the location of sphenopalatine foramen; and the circle, the location of the pterygoid canal. (B) The yellow arrow indicates the horn-shaped pterygoid canal and nerve. E, indicates ethmoid sinus; IT, inferior turbinate; MT, middle turbinate; SS, sphenoid sinus; NS, nasal septum; PC, posterior choana.