Sagittal Sinus ThrombosisSinus Thrombosis, IntracranialCranial SinusesSuperior Sagittal SinusCerebral VeinsDura MaterCavernous Sinus ThrombosisLateral Sinus ThrombosisCerebral AngiographyTomography, X-Ray ComputedIntracranial ThrombosisCerebral HemorrhageArachnoidThrombosisVenous ThrombosisCavernous SinusIntracranial HypertensionPhlebographyCentral Nervous System Vascular MalformationsMagnetic Resonance AngiographyMaxillary SinusParanasal SinusesMagnetic Resonance ImagingSinus of ValsalvaCarotid SinusFrontal SinusIntracranial Embolism and ThrombosisParanasal Sinus DiseasesIntracranial PressureSphenoid Sinus