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Histological hallmarks for AAV: (a) only segmental necrosis (Masson trichrome stain); (b) segmental necrosis with small crescent (hematoxylin and eosin); (c) necrotizing extracapillary lesion in half of glomerulus (Masson trichrome stain); (d) massive necrosis with circumferential crescent (silver stain). All panels at ×20 magnification.
Reproduced with permission from Ferrario et al.57
AAV, ANCA-associated vasculitis.
