Polyarteritis nodosa. Light micrograph of a section through muscle tissue, showing a blood vessel affected by polyarteritis nodosa (PAN). PAN is an un
Polyarteritis nodosa. Light micrograph of a section through muscle tissue, showing a blood vessel affected by polyarteritis nodosa (PAN). PAN is an uncommon condition that causes vasculitis (blood vessel swelling) of medium & small-sized arteries, which become swollen and damaged from attack by rogue immune cells. The cause of PAN is not well understood but may be associated with hepatitis B virus.
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