Venous ThrombosisThrombosisPortal VeinDura MaterVeinsThrombophlebitisFemoral VeinIliac VeinUpper Extremity Deep Vein ThrombosisPhlebographySinus Thrombosis, IntracranialMesenteric VeinsAnticoagulantsRenal VeinsPulmonary EmbolismJugular VeinsSplenic VeinSaphenous VeinPopliteal VeinVaricose VeinsSubclavian VeinCerebral VeinsCentral Nervous System Vascular MalformationsIntracranial ThrombosisCoronary ThrombosisFibrin Fibrinogen Degradation ProductsVena Cava, InferiorHeparin, Low-Molecular-WeightAxillary VeinThrombophiliaPostthrombotic SyndromeCarotid Artery ThrombosisBudd-Chiari SyndromeUltrasonography, Doppler, DuplexVenous ThromboembolismPulmonary VeinsHeparinProtein S DeficiencyTreatment OutcomeFactor VLegVena Cava FiltersThrombectomyFibrinolytic AgentsTomography, X-Ray ComputedThromboembolismWarfarinMesenteric Vascular OcclusionArteriovenous FistulaHepatic VeinsPostphlebitic SyndromeCavernous SinusStockings, CompressionPlethysmography, ImpedanceSagittal Sinus ThrombosisIntermittent Pneumatic Compression DevicesRetrospective StudiesRisk FactorsHypertension, PortalEmbolization, TherapeuticProspective StudiesFollow-Up StudiesUmbilical VeinsHemorrhageTime FactorsActivated Protein C ResistanceBandagesThrombolytic TherapyPostoperative ComplicationsVenous InsufficiencyProthrombinAntithrombin III DeficiencyPortasystemic Shunt, SurgicalRecurrenceLower ExtremityMeningeal ArteriesUltrasonography, DopplerIntracranial Embolism and ThrombosisAngiographyUltrasonography, Doppler, ColorCatheterization, Central VenousCatheterization, PeripheralBlood CoagulationCerebral AngiographyEnoxaparinProtein C DeficiencyFibrinogenAntiphospholipid SyndromeSplenorenal Shunt, SurgicalSplenectomyMagnetic Resonance ImagingVascular PatencyHemostasisRetinal Vein OcclusionEsophageal and Gastric VaricesPregnancy Complications, CardiovascularIncidenceUltrasonographyLiver TransplantationBrachiocephalic Veins