SYSTEMIC VASCULITIS
Systemic vasculitis Polyarteritis nodosa (PAN). Henoch–Schönlein purpura, hypersensitivity vasculitis. Vasculitis is a general term that refers to the inflammation of blood vessels. When blood vessels become inflamed, they can only react in limited ways. They may become weakened, stretch and increase in size, or become narrow – even to the point of closing off