Microscopic polyangiitis

Description

Necrotizing vasculitis, with few or no immune deposits, predominantly affecting small vessels (i.e., capillaries, venules, or arterioles). Necrotizing arteritis involving small and medium sized arteries may be present. Necrotizing glomerulonephritis is very common. Pulmonary capillaritis often occurs. Granulomatous inflammation is absent.

Index terms

Microscopic polyangiitis
MPA
Microscopic polyarteritis

Inclusions

Microscopic polyarteritis

Excludes

4A44.4 – Polyarteritis nodosa

Exclusions from above levels

02 – Neoplasms
18 – Complications of pregnancy, childbirth and the puerperium
20 – Developmental anomalies

Sibling codes

4A44.A1 – Granulomatosis with polyangiitis
4A44.A2 – Eosinophilic granulomatosis with polyangiitis
4A44.AY – Other specified antineutrophil cytoplasmic antibody-associated vasculitis
4A44.AZ – Antineutrophil cytoplasmic antibody-associated vasculitis, unspecified

Foundation entity

Microscopic polyangiitis – http://id.who.int/icd/entity/999231798

Part of: 4A44.A: Antineutrophil cytoplasmic antibody-associated vasculitis › 4A44: Vasculitis › 04: Diseases of the immune system