Polyarteritis nodosa

Disorder	Vasculitis	Epidemiology/Etiology	Clinical/Laboratory Findings
Polyarteritis nodosa	Necrotizing medium-sized vessel vasculitis involving renal, coronary, mesenteric arteries (spares pulmonary arteries)	Middle-aged men Association with HBsAg (30%)	Vessels at all stages of acute and chronic inflammation Focal vasculitis produces aneurysms (detected with angiography) Organ infarction in kidneys (renal failure), heart (acute MI), bowels (bloody diarrhea), skin (ischemic ulcer)