Subarachnoid HemorrhageSubarachnoid SpaceVasospasm, IntracranialIntracranial AneurysmAneurysm, RupturedCerebral AngiographyBasilar ArterySubarachnoid Hemorrhage, TraumaticCisterna MagnaTomography, X-Ray ComputedSpinal PunctureArachnoidHydrocephalusCerebral ArteriesRupture, SpontaneousGlasgow Outcome ScaleIntracranial PressureAnesthesia, SpinalIschemic Attack, TransientCerebral HemorrhageSurgical InstrumentsCerebrovascular CirculationCerebrospinal FluidArachnoiditisNimodipineVentriculostomyMeningesBrain IschemiaEmbolization, TherapeuticAngiography, Digital SubtractionHematoma, SubduralPancreatic NeoplasmsNeurosurgical ProceduresCerebral VentriculographyPregnatrienesTreatment OutcomeCraniotomyNeoplasmsVertebral ArteryBrainMagnetic Resonance ImagingGlasgow Coma ScaleCerebral InfarctionHeadacheCerebral VentriclesTime FactorsNeoplasms, Cystic, Mucinous, and SerousProspective StudiesDura MaterVentriculoperitoneal ShuntVertebral Artery DissectionCerebrospinal Fluid PressureRetrospective StudiesNeurosurgeryHeadache Disorders, PrimaryCerebral AqueductAnesthesia, ObstetricalCerebrovascular DisordersIntracranial HypertensionInjections, SpinalConsciousness DisordersCortical Spreading DepressionDisease Models, AnimalCerebrospinal Fluid ShuntsSubdural SpaceBupivacaineUltrasonography, Doppler, TranscranialFatal OutcomeHemosiderinSkin NeoplasmsIntracranial HemorrhagesDogsMeningeal NeoplasmsNeoplasms, Multiple PrimaryFollow-Up StudiesPapaverineBrain EdemaVasoconstrictionMiddle Cerebral ArteryIncidencePneumocephalusPosterior Cerebral ArteryMyelographyBrain InjuriesPrognosisMagnesium SulfatePia MaterCranial Fossa, PosteriorFourth VentricleIntracranial Arteriovenous MalformationsRisk FactorsKidney NeoplasmsArachnoid CystsNeoplasms, Second PrimaryNeurologic ExaminationSiderosisBlood-Brain BarrierHead Injuries, ClosedRecurrenceAcute Disease