According to the location and pneumatization of the sphenoidal sinus,110 posterior walls of sphenoidal sinus were assigned into three categories:thick walls(35.6%),thin walls(55.9%)and weak walls(8.5%).

• 结合蝶窦气化情况；将蝶窦后壁按厚度分为厚壁型(35.；6%25)、薄壁型(55