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. 2017 Dec 21;57(12):1757–1762. doi: 10.2169/internalmedicine.9844-17

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Copyright © 2018 by The Japanese Society of Internal Medicine

The Internal Medicine is an Open Access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. To view the details of this license, please visit (https://creativecommons.org/licenses/by-nc-nd/4.0/).

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Figure 1. — Light microscopic findings of the kidney biopsy. A. Light micrograph shows glomeruli with focal segmental necrotizing lesions (arrows). There are proteinaceous cast formations and mononuclear cell infiltration around a glomerulus with extensive dissolution of the Bowman’s capsule (arrow head). Tubulointerstitial nephritis with lymphoplasmacytic infiltration is not observed. (PAS staining) ×200. B. A glomerulus with fibrinoid necrosis and fibrocellular crescent formation (PAS staining) ×400. C. A small artery shows no vasculitis (Elastica-Masson staining) ×400. PAS: periodic acid-Schiff