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Case 1. Active nephritis shown on kidney biopsy. Native kidney biopsy showing the presence of crescent in an affected glomerulus (magnified ×10, high-power field, stained with periodic acid-Schiff). In a total of 20 glomeruli sampled, there were 8 fibrocellular crescents, 4 of which had segmental fibrinoid necrosis and segmental sclerosis (not shown).
