VasculitisSystemic VasculitisRetinal VasculitisAnti-Neutrophil Cytoplasmic Antibody-Associated VasculitisVasculitis, Central Nervous SystemPolyarteritis NodosaChurg-Strauss SyndromeSkin Diseases, VascularRheumatoid VasculitisMicroscopic PolyangiitisPurpura, Schoenlein-HenochCryoglobulinemiaDelayed DiagnosisMucocutaneous Lymph Node SyndromeArteritisSensitivity and SpecificityPrenatal DiagnosisEarly DiagnosisBiopsyRetrospective StudiesBehcet SyndromeGlomerulonephritisGiant Cell ArteritisCryoglobulinsPurpuraDiagnosisTakayasu ArteritisImmunosuppressive AgentsAutoimmune DiseasesAutoantibodiesTomography, X-Ray ComputedTreatment OutcomeFatal OutcomeDiagnostic ErrorsPrednisoloneLeg DermatosesMercuric ChlorideUrticariaPlasmapheresisFollow-Up StudiesLupus Erythematosus, SystemicSkin DiseasesProspective StudiesBiological MarkersEnzyme-Linked Immunosorbent AssaySeverity of Illness IndexMethylprednisoloneCecal DiseasesFever of Unknown OriginTemporal ArteriesPrognosisMagnetic Resonance ImagingImmunoglobulin GSyndromeAntigen-Antibody ComplexPredictive Value of TestsAntibodies, Monoclonal, Murine-DerivedRecurrenceCyclophosphamideTime FactorsAdrenal Cortex HormonesPlasma ExchangeArthritis, RheumatoidCogan SyndromeReproducibility of ResultsArthus ReactionRheumatoid FactorAcute DiseaseNursing DiagnosisAzathioprineDiagnosis, Computer-AssistedPeripheral Nervous System DiseasesSerine EndopeptidasesRisk FactorsCase-Control StudiesImmunoglobulins, IntravenousPolymerase Chain ReactionImmune Complex DiseasesGlucocorticoidsNecrosisNeutrophilsSkinLung DiseasesRheumatic DiseasesCohort StudiesSkin UlcerRemission InductionPulse Therapy, DrugAnti-Inflammatory AgentsImmunologic FactorsImmunoglobulin MPreimplantation DiagnosisScleritisTuberculosis, OcularInfant, NewbornKidney DiseasesPregnancyBiopsy, NeedleAntibodies, AntinuclearPrednisone