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Immune Complex Small-Vessel Vasculitis: IgA Vasculitis (Henoch–Schönlein) and Hypersensitivity Vasculitis
Necrotizing vasculitis that affects small blood vessels (especially the postcapillary venules, capillaries, and arterioles) is often caused by immune complex deposition and may show leukocytoclastic vasculitis on histology ( Fig. 33.1 and Box 33.1 ). , The term leukocytoclasis refers…