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. 2020 Aug 26;21:366. doi: 10.1186/s12882-020-02015-0

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 2 — Findings of renal biopsy. Light microscopy showed segmental moderate mesangial hypercellularity (arrowheads in a: PAS stain × 400) and crescent formation including cellular crescent (arrow in b: PAM stain × 400). Immunofluorescence showed positive staining for IgA and C3 in mesangial areas (c: IgA, d: C3 × 400). Electron microscopy revealed electron-dense deposits in mesangial and paramesangial areas (arrows in e: × 1500), and segmental moderate subendothelial edema (arrowheads in e)