Granulomatosis with polyangiitis (GPA) is a primary, necrotizing granulomatous vasculitis, involving small- to medium-sized arteries, that causes systemic disease. Almost any organ can be affected, but the most affected systems are the upper airways, lungs, kidneys, eyes and peripheral nerves. Migratory polyarthritis is reported in approximately 25% of patients with anti-neutrophil cytoplasmic antibody (ANCA) associated…
