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. 2021 Aug 17;100(4):937–938. doi: 10.1016/j.kint.2021.07.026

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© 2021 International Society of Nephrology. Published by Elsevier Inc. All rights reserved.

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Kidney biopsy showing extracapillary proliferation images with fibrocellular (a), fibrous (b), and cellular crescents (c),and withthepresence of fibrinogen deposits inthecontext of fibrinoid necrosis with extracapillary proliferation (d). Bars = 50 μm. (a,b) Hematoxylin and eosin, original magnification ×20. (c) Periodic acid–Schiff, original magnification ×20. (d) Direct immunofluorescence, original magnification ×20. To optimize viewing of this image, please see the online version of this article at www.kidney-international.org.