Iliac VeinMay-Thurner SyndromeFemoral VeinPhlebographyVena Cava, InferiorVenous ThrombosisIliac ArteryVeinsConstriction, PathologicSaphenous VeinUreterostomyPortal VeinVaricose VeinsMesenteric VeinsKlippel-Trenaunay-Weber SyndromePeripheral Vascular DiseasesPulmonary VeinsThrombectomyVascular NeoplasmsJugular VeinsPostthrombotic SyndromeVena Cava FiltersVascular DiseasesVaricose UlcerVenous InsufficiencyVascular PatencyRupture, SpontaneousUltrasonography, Doppler, DuplexCatheterization, PeripheralStentsRenal VeinsVascular Surgical ProceduresUmbilical VeinsArteriovenous FistulaEdemaIatrogenic DiseasePelvisTomography, X-Ray ComputedHepatic VeinsPopliteal VeinUltrasonography, InterventionalWounds, GunshotRetroperitoneal SpacePulmonary EmbolismAnticoagulantsArteriovenous Shunt, SurgicalAngioplasty, BalloonSubclavian VeinAnastomosis, SurgicalLegSplenic VeinCerebral VeinsTreatment OutcomeCatheterizationLower ExtremityRetinal VeinUltrasonography, Doppler, ColorBlood Vessel Prosthesis ImplantationLigationAzygos VeinBrachiocephalic Veins