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Wegener’s granulomatosis and microscopic polyangiitis

Wegener’s granulomatosis (also known as granulomatosis with polyangiitis) is a type of vasculitis that affects small and medium blood vessels. Symptoms can include saddle nose deformity, chronic sinusitis, and collapsed trachea. Microscopic polyangiitis is similar to wegener’s granulomatosis except it only affects small blood vessels in the lungs or kidneys. Learn how the presence of granulomas and antibodies (cANCA and pANCA) differentiate these two conditions. Created by Ian Mannarino.