Cerebral VeinsIntracranial ThrombosisSinus Thrombosis, IntracranialSagittal Sinus ThrombosisCavernous Sinus ThrombosisVenous ThrombosisCranial SinusesLateral Sinus ThrombosisThrombosisDura MaterCavernous SinusCerebral AngiographyVeinsPhlebographyPortal VeinThrombophlebitisSuperior Sagittal SinusAnticoagulantsFemoral VeinIntracranial Embolism and ThrombosisTomography, X-Ray ComputedMeningeal ArteriesIliac VeinIntracranial HypertensionCoronary ThrombosisUpper Extremity Deep Vein ThrombosisCerebral ArteriesSphenoid SinusMagnetic Resonance ImagingMesenteric VeinsCerebral InfarctionCerebrovascular CirculationHeparinCarotid Artery ThrombosisRenal VeinsJugular VeinsMastoiditisThrombectomyPopliteal VeinSubclavian VeinSplenic VeinMagnetic Resonance AngiographyFibrinolytic AgentsPulmonary EmbolismSaphenous VeinVaricose VeinsMaxillary SinusPseudotumor CerebriPapilledemaCentral Nervous System Vascular MalformationsUltrasonography, Doppler, ColorTreatment OutcomeCerebral HemorrhageThrombolytic TherapyParanasal SinusesThrombophiliaHeparin, Low-Molecular-WeightVena Cava, InferiorFibrin Fibrinogen Degradation ProductsTransverse SinusesSinus of ValsalvaFollow-Up StudiesMastoidHeadacheAxillary VeinRetrospective StudiesSphenoid SinusitisRisk FactorsCarotid SinusPostthrombotic SyndromeFactor VFrontal SinusProspective StudiesBudd-Chiari SyndromeVenous ThromboembolismUltrasonography, Doppler, DuplexBlood Coagulation DisordersPutaminal HemorrhageStreptococcus constellatusProtein S DeficiencyParanasal Sinus DiseasesThromboembolismEye ManifestationsCerebral PalsyTime FactorsIntracranial AneurysmUltrasonography, Doppler, TranscranialOrbital DiseasesCoronary SinusPulmonary VeinsWarfarinBattered Child SyndromeMiddle Cerebral ArteryVena Cava FiltersAcute DiseaseContraceptives, OralUrokinase-Type Plasminogen ActivatorMesenteric Vascular OcclusionBrainPostphlebitic Syndrome