Portal VeinHypertension, PortalUltrasonographyPortal SystemVeinsMesenteric VeinsUltrasonography, Doppler, ColorPortal PressureLiver CirculationSaphenous VeinHepatic VeinsUltrasonography, DopplerVaricose VeinsHepatic ArterySplenic VeinFemoral VeinVenous ThrombosisPortographyJugular VeinsUltrasonography, PrenatalPortasystemic Shunt, SurgicalPulmonary VeinsLiverIliac VeinUltrasonography, Doppler, DuplexRenal VeinsLiver NeoplasmsEsophageal and Gastric VaricesTomography, X-Ray ComputedHepatectomyLiver CirrhosisEndosonographyUmbilical VeinsPortacaval Shunt, SurgicalLiver TransplantationUltrasonography, Doppler, PulsedVena Cava, InferiorPopliteal VeinUltrasonography, InterventionalSplenorenal Shunt, SurgicalSplanchnic CirculationCarcinoma, HepatocellularLigationUltrasonography, MammarySensitivity and SpecificityBlood Flow VelocityProspective StudiesTreatment OutcomeSubclavian VeinSulfur HexafluorideContrast MediaRetrospective StudiesBudd-Chiari SyndromeSplenic ArteryLiver DiseasesUltrasonography, Doppler, TranscranialVenous PressureGastrointestinal HemorrhageAngiographyPhlebographyThrombosisAzygos VeinMuscle, Smooth, VascularSplenectomyRegional Blood FlowPreoperative CareEmbolization, TherapeuticAnastomosis, SurgicalCerebral VeinsDogsTime FactorsPortasystemic Shunt, Transjugular IntrahepaticPregnancyConstriction, PathologicImaging, Three-DimensionalSplenic DiseasesRetinal VeinPostoperative ComplicationsLiver Diseases, ParasiticLiving DonorsFollow-Up StudiesBile DuctsBrachiocephalic VeinsPredictive Value of TestsReproducibility of ResultsHypersplenismNorepinephrineChemoembolization, TherapeuticGallbladderVenae CavaeAbdominal InjuriesAxillary VeinSclerotherapySplenomegalyAscitesLiver Function TestsRabbitsRetinal Vein OcclusionMagnetic Resonance ImagingThrombophlebitis