Subarachnoid HemorrhageHydrocephalusVasospasm, IntracranialSubarachnoid SpaceHydrocephalus, Normal PressureIntracranial AneurysmCerebrospinal Fluid ShuntsCerebral HemorrhageAneurysm, RupturedVentriculostomyVentriculoperitoneal ShuntCerebral AqueductHemorrhageCerebral AngiographyBasilar ArterySpinal PunctureIntracranial HemorrhagesTomography, X-Ray ComputedCerebral VentriclesThird VentricleIntracranial PressureRupture, SpontaneousCerebral ArteriesCerebral VentriculographySubarachnoid Hemorrhage, TraumaticGlasgow Outcome ScaleCisterna MagnaNeuroendoscopyFourth VentricleCerebrovascular CirculationPneumoencephalographyCerebrospinal Fluid PressureIschemic Attack, TransientNeurosurgical ProceduresBrain IschemiaSurgical InstrumentsArachnoidEmbolization, TherapeuticCerebrospinal FluidRetinal HemorrhageHematoma, SubduralBrainNimodipineTreatment OutcomeGlasgow Coma ScaleAngiography, Digital SubtractionCraniotomyMagnetic Resonance ImagingCerebral InfarctionVitreous HemorrhageProspective StudiesHeadacheVertebral ArteryIntracranial HypertensionPostpartum HemorrhageMeningesTime FactorsPregnatrienesEpendymaRetrospective StudiesIntracranial Hemorrhage, HypertensiveHematomaPutaminal HemorrhageGastrointestinal HemorrhageVertebral Artery DissectionNeurosurgeryIntracranial Arteriovenous MalformationsLateral VentriclesCerebrovascular DisordersBrain EdemaConsciousness DisordersFatal OutcomeEye HemorrhageDisease Models, AnimalHeadache Disorders, PrimaryMeningomyeloceleUltrasonography, Doppler, TranscranialBrain DiseasesCranial Fossa, PosteriorSpinal DysraphismArachnoiditisNeurologic ExaminationFollow-Up StudiesAcute DiseaseCortical Spreading DepressionBasal Ganglia HemorrhageRisk FactorsPostoperative ComplicationsHematoma, Subdural, IntracranialDura MaterMiddle Cerebral ArteryRecurrencePosterior Cerebral ArteryMeningitisPrognosisStrokeHemosiderinBrain InjuriesMagnesium SulfateIncidence