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Renal biopsy specimen included 30 glomeruli, including 5 cellular crescents and 6 fibrocellular crescents. a Representative glomerulus containing cellular crescents with necrotizing lesion is shown (Periodic acid Schiff staining ×200). b Small artery exhibited granulomatous reaction with multinucleated giant cell formation (A arrow) and the destruction of elastic fibers (Elastica van Gieson staining ×200). c There was no staining of the IgG on immunofluorescence staining (×200)
