VasculitisSystemic VasculitisRetinal VasculitisAnti-Neutrophil Cytoplasmic Antibody-Associated VasculitisVasculitis, Central Nervous SystemPolyarteritis NodosaImage Processing, Computer-AssistedChurg-Strauss SyndromeSkin Diseases, VascularRheumatoid VasculitisMicroscopic PolyangiitisImage Interpretation, Computer-AssistedPurpura, Schoenlein-HenochCryoglobulinemiaRadiographic Image EnhancementArteritisMucocutaneous Lymph Node SyndromeRadiographic Image Interpretation, Computer-AssistedBehcet SyndromeGlomerulonephritisCryoglobulinsImaging, Three-DimensionalGiant Cell ArteritisPurpuraAlgorithmsTakayasu ArteritisTomography, X-Ray ComputedReproducibility of ResultsAutoimmune DiseasesSensitivity and SpecificityImmunosuppressive AgentsAutoantibodiesMercuric ChlorideLeg DermatosesPlasmapheresisSubtraction TechniqueUrticariaPrednisoloneBiopsyLupus Erythematosus, SystemicAntigen-Antibody ComplexTemporal ArteriesAntibodies, Monoclonal, Murine-DerivedPattern Recognition, AutomatedMethylprednisoloneCogan SyndromePlasma ExchangeRetrospective StudiesArthus ReactionCyclophosphamideCecal DiseasesArthritis, RheumatoidSerine EndopeptidasesSkin DiseasesImmune Complex DiseasesObserver VariationBrainRheumatoid FactorAzathioprineFever of Unknown OriginAdrenal Cortex HormonesNeutrophilsImmunoglobulins, IntravenousImmunoglobulin GPeripheral Nervous System DiseasesDiagnostic ImagingNecrosisContrast MediaTreatment OutcomePulse Therapy, DrugScleritisImmunologic FactorsFatal OutcomeSkinGlucocorticoids