microscopic polyangiitis

initialism: MPA
https://doi.org/10.1351/goldbook.13459
ANCA-associated necrotizing, pauci-immune vasculitis of the small vessels (capillaries, venules, arterioles) frequently associated with rapidly progressive glomerulonephritis and/or hemorrhagic alveolitis as well as autoantibodies against myeloperoxidase.
Source:
PAC, 2012, 84, 1113. (IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1213 [Terms] [Paper]