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. 2021 Jan 6;22:6. doi: 10.1186/s12882-020-02204-x

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© The Author(s) 2021

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. 1 — Renal biopsy findings of case 1. a showed IgA linear staining along glomerular capillary wall and tubular basement membrane (× 200). b showed λ linear staining along glomerular capillary wall and tubular basement membrane (× 200). c showed λ was strong positive on the protein casts (× 200). d showed minimal mesangial proliferation of the glomeruli (PASM+Masson, × 400). e showed PAS negative protein casts in the tubular lumen (PAS, × 400). f showed fibrillary structure in the peripheral of the protein casts (PASM+Masson, × 400). g showed mononuclear cells in the center of the protein casts (H&E, × 400). h showed the protein casts was Congo red positive (Congo red staining, × 200). i showed the protein revealed apple-green birefringence with polarized microscopy (Congo red staining, × 200). j showed normal glomerular without fine granular deposits along the capillary wall (× 6000)