Microscopic polyangiitis

Microscopic polyangiitis is a rare, systemic autoimmune disease characterized by necrotizing vasculitis that predominantly targets small-caliber blood vessels, including arterioles, capillaries, and venules As a form of antineutrophil cytoplasmic antibody-associated vasculitis, it classically demonstrates pauci-immune vascular inflammation—marked by minimal or absent immune deposit formation—and most frequently associates with circulating myeloperoxidase-specific autoantibodies

Microscopic polyangiitis is a rare, systemic autoimmune disease characterized by necrotizing vasculitis that predominantly targets small-caliber blood vessels, including arterioles, capillaries, and venules As a form of antineutrophil cytoplasmic antibody-associated vasculitis, it classically demonstrates pauci-immune vascular inflammation—marked by minimal or absent immune deposit formation—and most frequently associates with circulating myeloperoxidase-specific autoantibodies Although the cond...

As a form of antineutrophil cytoplasmic antibody-associated vasculitis, it classically demonstrates pauci-immune vascular inflammation—marked by minimal or absent immune deposit formation—and most frequently associates with circulating myeloperoxidase-specific autoantibodies

Although the condition can affect individuals of any age across diverse organ systems, it most commonly presents in middle-aged to older adults with rapidly progressive glomerulonephritis, alveolar hemorrhage secondary to pulmonary capillaritis, systemic constitutional symptoms, and peripheral neuropathy

Although the condition can affect individuals of any age across diverse organ systems, it most commonly presents in middle-aged to older adults with rapidly progressive glomerulonephritis, alveolar hemorrhage secondary to pulmonary capillaritis, systemic constitutional symptoms, and peripheral neuropathy

Although the condition can affect individuals of any age across diverse organ systems, it most commonly presents in middle-aged to older adults with rapidly progressive glomerulonephritis, alveolar hemorrhage secondary to pulmonary capillaritis, systemic constitutional symptoms, and peripheral neuropathy

Unlike related vasculitides, microscopic polyangiitis is histopathologically defined by the absence of granulomatous inflammation