Sphenoid BoneEmpty Sella SyndromeSphenoid SinusSphenoid SinusitisSkull NeoplasmsCranial Fossa, MiddleBone and BonesTomography, X-Ray ComputedCerebrospinal Fluid RhinorrheaParanasal Sinus DiseasesParanasal Sinus NeoplasmsMagnetic Resonance ImagingPneumoencephalographyBone RemodelingSkull BaseBone Density