Vena Cava, SuperiorVena Cava, InferiorSuperior Vena Cava SyndromeVena Cava FiltersVenae CavaeAzygos VeinBrachiocephalic VeinsPhlebographyVascular MalformationsHeart AtriaCatheterization, Central VenousCoronary SinusRenal VeinsVascular NeoplasmsVenous ThrombosisHepatic VeinsBudd-Chiari SyndromePulmonary EmbolismPulmonary VeinsInferior ColliculiJugular VeinsTomography, X-Ray ComputedDevice RemovalIliac VeinHeart Bypass, RightSubclavian VeinConstriction, PathologicMediastinal DiseasesTreatment OutcomeMediastinal NeoplasmsCatheter AblationHeart Defects, CongenitalIncidental FindingsVenous PressureCardiovascular AbnormalitiesVascular DiseasesVeinsFemoral VeinProsthesis ImplantationScimitar SyndromeHeart NeoplasmsPacemaker, ArtificialHeart Septal Defects, AtrialCatheterizationAnastomosis, SurgicalChylothoraxEchocardiography, TransesophagealEquipment FailureLeiomyosarcomaCollateral CirculationStentsEchocardiographyThrombosisPulmonary ArteryMagnetic Resonance ImagingPortal VeinCyanosisCentral Venous CathetersFontan ProcedurePeritoneovenous ShuntDogsMediastinal CystAtrial FlutterCardiac Surgical ProceduresElectrodes, ImplantedCatheters, IndwellingBlood Vessel Prosthesis ImplantationPolytetrafluoroethyleneVascular Surgical ProceduresForeign-Body MigrationSuperior ColliculiTricuspid ValvePericardiumAbnormalities, MultipleMediastinitisConstrictionHydrothoraxTime FactorsThrombophlebitisMesenteric Artery, InferiorHeart Septal DefectsCardiac CatheterizationAtrial SeptumHeterotaxy SyndromeFollow-Up StudiesElectrophysiologic Techniques, CardiacThymomaSinoatrial NodeRetrospective StudiesBlood Flow VelocityAtrial FibrillationArteriovenous FistulaCoronary Vessel AnomaliesFatal OutcomeSitus InversusCardiac Pacing, ArtificialUltrasonography, PrenatalAnticoagulantsMesenteric Artery, SuperiorDilatation, Pathologic