Foramen MagnumOccipital BoneArnold-Chiari MalformationSyringomyeliaSex Determination by SkeletonCranial Fossa, PosteriorCervical AtlasPlatybasiaAtlanto-Occipital JointForamen Ovale, PatentMeningiomaSkull BaseSubarachnoid SpaceArachnoid CystsEncephaloceleMeningeal NeoplasmsSkullDandy-Walker SyndromeAchondroplasiaCisterna MagnaDecompression, SurgicalNeurosurgeryAnthropology, PhysicalNeurosurgical ProceduresCerebrospinal Fluid PressureCervical VertebraeSpinal CanalDura MaterMyelographyForamen OvaleMagnetic Resonance ImagingSpinal Cord CompressionAtlanto-Axial JointSkull NeoplasmsCerebrospinal FluidCerebellar DiseasesOviductsCraniotomyRadiosurgeryTreatment OutcomeTime FactorsTrigeminal NeuralgiaSella Turcica