Subarachnoid HemorrhageHeadacheSubarachnoid SpaceHeadache DisordersTension-Type HeadacheCluster HeadacheVasospasm, IntracranialVascular HeadachesMigraine DisordersIntracranial AneurysmHeadache Disorders, SecondaryAneurysm, RupturedCerebral AngiographySpinal PunctureBasilar ArteryTomography, X-Ray ComputedSubarachnoid Hemorrhage, TraumaticCisterna MagnaArachnoidHydrocephalusCerebral ArteriesRupture, SpontaneousAnesthesia, SpinalIntracranial PressureDura MaterMigraine without AuraGlasgow Outcome ScaleCerebral HemorrhageMeningesCerebrospinal FluidIschemic Attack, TransientNeurosurgical ProceduresSurgical InstrumentsTreatment OutcomeHematoma, SubduralMagnetic Resonance ImagingCerebrovascular CirculationVentriculostomyNimodipineEmbolization, TherapeuticArachnoiditisCerebral VentriculographyBrain IschemiaCraniotomyAngiography, Digital SubtractionProspective StudiesBrainMigraine with AuraCerebrospinal Fluid PressureCerebral InfarctionVertebral ArteryTime FactorsBlood Patch, EpiduralNeurologic ExaminationGlasgow Coma ScaleVertebral Artery DissectionNeurosurgeryAnalgesicsPregnatrienesVentriculoperitoneal ShuntCerebral VentriclesIntracranial HypertensionNeurologyRetrospective StudiesTrigeminal Autonomic CephalalgiasConsciousness DisordersAnesthesia, ObstetricalTryptaminesSumatriptanCerebrovascular DisordersCortical Spreading DepressionIntracranial HemorrhagesHeadache Disorders, PrimaryCerebral AqueductArachnoid CystsArnold-Chiari MalformationInjections, SpinalIntracranial Arteriovenous MalformationsUltrasonography, Doppler, TranscranialCerebrospinal Fluid ShuntsFollow-Up StudiesRecurrenceSubdural SpaceIntracranial HypotensionPseudotumor CerebriPneumocephalusRisk FactorsBupivacaineMeningitisBrain DiseasesSeverity of Illness IndexFacial NeuralgiaBrain EdemaAcute DiseaseBrain InjuriesTrigeminal NerveFourth VentricleMiddle Cerebral ArteryCraniocerebral TraumaFatal Outcome