Venous ThrombosisPortal VeinThrombosisHypertension, PortalHypertensionVeinsThrombophlebitisFemoral VeinPortal SystemHypertension, PulmonaryIliac VeinUpper Extremity Deep Vein ThrombosisPhlebographyMesenteric VeinsSplenic VeinRenal VeinsAnticoagulantsPulmonary EmbolismVaricose VeinsJugular VeinsSaphenous VeinPopliteal VeinSubclavian VeinSinus Thrombosis, IntracranialIntracranial ThrombosisCoronary ThrombosisPortal PressureVena Cava, InferiorHypertension, RenalBlood PressureRegional Blood FlowFibrin Fibrinogen Degradation ProductsHeparin, Low-Molecular-WeightBlood Flow VelocityAxillary VeinRisk FactorsHepatic VeinsThrombophiliaBudd-Chiari SyndromeTreatment OutcomeCerebral VeinsPortasystemic Shunt, SurgicalPostthrombotic SyndromeCarotid Artery ThrombosisUltrasonography, Doppler, DuplexPulmonary VeinsHypertension, RenovascularAntihypertensive AgentsTime FactorsEsophageal and Gastric VaricesLiver CirculationVenous ThromboembolismHeparinProspective StudiesLegRetrospective StudiesProtein S DeficiencyFollow-Up StudiesFactor VThrombectomyThromboembolismHypertension, MalignantFibrinolytic AgentsVena Cava FiltersWarfarinTomography, X-Ray ComputedMesenteric Vascular OcclusionPregnancy Complications, CardiovascularLiver CirrhosisUltrasonography, DopplerPlethysmography, ImpedancePostphlebitic SyndromeStockings, CompressionIntermittent Pneumatic Compression DevicesHemorrhageSplenorenal Shunt, SurgicalFlow CytometryUltrasonography, Doppler, ColorPostoperative ComplicationsUmbilical VeinsPortacaval Shunt, SurgicalSplenectomyHepatic ArteryThrombolytic TherapyLiver TransplantationRecurrenceGastrointestinal HemorrhageActivated Protein C ResistanceVenous InsufficiencyBandagesIncidenceProthrombinAngiographySagittal Sinus ThrombosisHypersplenismRisk AssessmentLigationIntracranial Embolism and ThrombosisLower ExtremitySplanchnic Circulation