Figure 21

Many different approaches to categorizing vasculitis exist. We use the approach adopted by the Chapel Hill International Consensus Conference on the Nomenclature of Systemic Vasculitis [3]. The Chapel Hill System divides vasculitides into those that have a predilection for large arteries (ie, the aorta and its major branches), medium-sized vessels (ie, main visceral arteries), and small vessels (predominantly capillaries, venules, and arterioles, and occasionally, small arteries). However, there is so much overlap in the size of the vessel involved by different vasculitides that other criteria are very important for precise diagnosis, especially when distinguishing among the different types of small vessel vasculitis. ANCA—anti-neutrophil cytoplasmic antibody.

Distribution of renal vascular involvement

Distribution of renal vascular involvement

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