what is polyarteritis nodosa
Polyarteritis Nodosa. Polyarteritis nodosa (PAN) is a rare disease that results from blood vessel inflammation (vasculitis) causing injury to organ systems. The areas most commonly affected by PAN include the nerves, intestinal tract, heart, and joints.asculitis is a general term that refers to inflammation of the blood vessels. When inflamed, the blood vessel may become weakened and stretch in size, which can lead to aneurysms, or become so thin that they rupture resulting in bleeding into the tissue.