Subarachnoid HemorrhageSubarachnoid SpaceCerebrospinal FluidVasospasm, IntracranialCerebrospinal Fluid ProteinsIntracranial AneurysmCerebrospinal Fluid RhinorrheaCerebrospinal Fluid PressureSpinal PunctureAneurysm, RupturedCerebrospinal Fluid ShuntsMeningitisHydrocephalusCisterna MagnaBasilar ArteryCerebral AngiographyArachnoidIntracranial PressureSubarachnoid Hemorrhage, TraumaticTomography, X-Ray ComputedCerebral ArteriesMeningitis, BacterialMeningesVentriculostomyCerebral VentriclesCerebrospinal Fluid OtorrheaBrainAnesthesia, SpinalRupture, SpontaneousMeningitis, ViralGlasgow Outcome ScaleMeningitis, PneumococcalMeningitis, AsepticVentriculoperitoneal ShuntTuberculosis, MeningealCerebral HemorrhageArachnoiditisChoroid PlexusCerebral VentriculographyCerebrovascular CirculationMagnetic Resonance ImagingIschemic Attack, TransientBlood-Brain BarrierDura MaterNeurosurgical ProceduresInjections, SpinalSurgical InstrumentsHeadacheCraniotomyPneumoencephalographyBrain IschemiaNervous System DiseasesHematoma, SubduralMeningoencephalitisBrain DiseasesTime FactorsNimodipineNeurosyphilisCerebral AqueductCerebral InfarctionGlasgow Coma ScaleCentral Nervous System DiseasesAngiography, Digital SubtractionTreatment OutcomeEmbolization, TherapeuticIntracranial HypertensionNeurocysticercosisProspective StudiesVertebral ArteryPneumocephalusMyelographyPregnatrienesInjections, IntraventricularMeningeal NeoplasmsEncephalitisArachnoid CystsPia MaterSyringomyeliaSensitivity and SpecificityRetrospective StudiesMultiple SclerosisOligoclonal BandsCerebrovascular DisordersHydrocephalus, Normal PressureNeurosurgeryBiological MarkersHeadache Disorders, PrimaryDogsMeningitis, FungalEncephaloceleDisease Models, AnimalHydroxyindoleacetic AcidBrain InjuriesConsciousness DisordersSpinal CordFatal OutcomeAnesthesia, ObstetricalVertebral Artery DissectionBupivacaineLyme Neuroborreliosis