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. 2023 Jan 18;23:26. doi: 10.1186/s12886-022-02743-x

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© The Author(s) 2023

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. 6 — Renal biopsy from patient 20 of Table 1: a) The interlobular artery is extensively affected by a granulomatous necrotizing inflammatory process. The vessel wall is poorly recognizable due to the presence of wide areas of necrosis and leukocyte infiltration. Multinuclear giant cells can be seen in the infiltrate (arrow) (periodic acid Schiff, × 400). b) A small artery with fibrinoid necrosis of the wall and perivascular lympho-monocyte infiltration (methenamine silver, × 400). c) Fibrinoid necrosis of the wall of a small artery (methenamine silver, × 400)