Polyarteritis nodosa

Periarteritis nodosa; PAN; Systemic necrotizing vasculitis

Polyarteritis nodosa is a serious blood vessel disease. The small and medium-sized arteries become swollen and damaged.

Polyarteritis, microscopic on the shin

This is a picture of microscopic polyarteritis on the shin. The term polyarteritis means that many blood vessels are inflamed. These nodules are located just below the skin's surface (subcutaneous), are barely felt when pressing on the skin (palpable), and are tender. The skin is typically red (erythematous).

Microscopic polyarteritis 2

Polyarteritis nodosa, seen here on a lower extremity, produces painful, erythematous nodules. Arteries in the deep dermis and upper fat show neutrophilic infiltration.

Circulatory system

Blood used by the body is brought back to the heart and lungs by the veins of the body. Once the blood has gathered more oxygen from the lungs, it is pumped back out to the body through the arteries.

Causes

Symptoms

Exams and Tests

Treatment

Outlook (Prognosis)

Possible Complications

When to Contact a Medical Professional

Prevention