**Abstract**

Antineutrophil cytoplasmic antibodies (ANCA)-associated diseases are necrotizing systemic vasculitides that affect small blood vessels (arterioles, capillaries and venules). This entity represents three main systemic vasculitides: granulomatosis with polyangiitis (GPA; formerly Wegener's granulomatosis), microscopic polyangiitis (MPA) and eosinophilic granulomatosis with polyangiitis (EGPA; formerly known as Churg-Strauss' syndrome). Their clinical manifestations are polymorphous, being the most frequent respiratory, oto-laryngo-pharyngeal and renal involvement. Peripheral neuropathy (PN) is reported in almost 50% of the patients. The aim of this chapter is to discuss the prevalence, clinical presentation, treatment and prognosis of PN in ANCA-associated vasculitis.

**Keywords:** ANCA vasculitis, peripheral neuropathy, granulomatosis with polyangiitis (Wegener's), microscopic polyangiitis, eosinophilic granulomatous with polyangiitis
