Subarachnoid SpaceSubarachnoid HemorrhageArachnoidCerebrospinal FluidMeningesArachnoid CystsCisterna MagnaDura MaterCerebral ArteriesVasospasm, IntracranialCerebrospinal Fluid PressureMeningeal NeoplasmsCerebral AngiographyMagnetic Resonance ImagingCerebral VentriclesArnold-Chiari MalformationCerebrospinal Fluid ShuntsMeningiomaTomography, X-Ray ComputedHydrocephalusPneumoencephalographyHematoma, SubduralCerebral VentriculographyInjections, SpinalIntracranial PressureBrainSubdural SpaceIntracranial AneurysmCerebrovascular CirculationSyringomyeliaCerebral InfarctionArachnoiditisCerebral AqueductSpinal PunctureAnesthesia, SpinalMicroscopy, Electron, Scanning TransmissionMyelographyMeningitisAneurysm, RupturedBattered Child SyndromeMiddle Cerebral ArteryForamen MagnumChondromaCerebral PalsyPerceptual ClosureBasilar ArteryEpidural SpaceVentriculostomyChloral HydrateField Dependence-IndependenceSpinal CanalBrain DiseasesMeningitis, PneumococcalSpinal CordBrain IschemiaCerebral HemorrhageForm PerceptionOptic NerveCephalometryNeurosurgical ProceduresScoliosisCerebrospinal Fluid ProteinsCranial Fossa, PosteriorBlood-Brain BarrierImaging, Three-DimensionalRetrognathiaLaminectomyCerebral VeinsTime FactorsInfarction, Middle Cerebral ArteryIschemic Attack, TransientHematoma, Subdural, AcuteDisease Models, AnimalAnesthesia, EpiduralMalaria, CerebralCerebrospinal Fluid RhinorrheaFaceHydrocephalus, Normal PressureBupivacaineDepth PerceptionMaxillaSubarachnoid Hemorrhage, TraumaticBrain NeoplasmsMalocclusion, Angle Class II