Sagittal Sinus ThrombosisSinus Thrombosis, IntracranialCranial SinusesSuperior Sagittal SinusCerebral VeinsCavernous Sinus ThrombosisLateral Sinus ThrombosisCerebral AngiographyCranial Fossa, AnteriorDura MaterIntracranial ThrombosisCentral Nervous System Vascular MalformationsCerebral HemorrhageTomography, X-Ray ComputedThrombosisVenous ThrombosisIntracranial HypertensionCavernous SinusPhlebographyVeinsMagnetic Resonance ImagingArteriovenous FistulaIntracranial Embolism and ThrombosisMagnetic Resonance AngiographyIntracranial Pressure