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(A) Arteriolar necrotizing vasculitis. Black arrow: fibrinoid necrosis; black asterisk: vascular lumen; white asterisk: perivascular inflammatory infiltrate. Haematoxylin and eosin stain, original magnification ×400. (B) Acute tubular necrosis associated with ischaemic glomeruli. Black asterisk: ischaemic glomerulus. Masson’s trichome stain, original magnification ×400.
