Microscopic polyangiitis

Disorder	Vasculitis	Epidemiology/Etiology	Clinical/Laboratory Findings
Microscopic polyangiitis	Small vessel vasculitis involving skin, lung, brain, GI tract, and postcapillary venules and glomerular capillaries	Children and adults Precipitated by drugs (e.g., penicillin), infections (e.g., streptococci), immune disorders (e.g., SLE)	Vessels at same stage of inflammation Palpable purpura, glomerulonephritis p-ANCA antibodies (>80% of cases)