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Polyarteritis nodosa is a type of vasculitis that affects small to medium arteries and leads to significant narrowing of the vasculature. Patients with polyarteritis nodosa can have symptoms like bloody diarrhea, skin lesions, and impaired motor function caused by neuropathy. Learn how health care professionals diagnose and treat polyarteritis nodosa by examining arteriograms and prescribing steroids. Created by Ian Mannarino.