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Microscopic polyangiitis

Disease definition

Microscopic polyangiitis (MPA) is an inflammatory, necrotizing, systemic vasculitis that affects predominantly small vessels (i.e. small arteries, arterioles, capillaries, venules) in multiple organs.


  • Synonym(s):
    • MPA
    • Micropolyangiitis
    • Microscopic polyarteritis
  • Prevalence: 1-9 / 100 000
  • Inheritance: Not applicable 
  • Age of onset: Adult
  • ICD-10: M31.7
  • OMIM: -
  • UMLS: C0343192
  • MeSH: D055953
  • GARD: 3652
  • MedDRA: 10063344
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