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. 2022 May 3;7(8):1913–1916. doi: 10.1016/j.ekir.2022.04.089

Figure 1.

Figure 1

Kidney biopsy findings. (a) The glomerulus exhibits endocapillary hypercellularity with abundant intracapillary infiltrating neutrophils and monocytes, mesangial sclerosis and hypercellularity, thickening of the GBM, and a tiny cellular crescent (arrow) (periodic acid-Schiff, ×400). An adjacent arteriole has intimal hyalinosis. (b) Another glomerulus reveals nodular mesangial sclerosis and a fibrocellular crescent associated with fibrinoid necrosis (small arrow) and rupture of Bowman’s capsule (long arrow) (trichrome stain, ×200). (c) There is bright, linear staining of the GBM and few tubular basement membranes (arrow) for IgG (immunofluorescent image, ×200). (d) There is bright, linear GBM staining for IgG2 (immunofluorescent image, ×400). The glomeruli were negative for IgG1, IgG3, and IgG4 (not illustrated). GBM, glomerular basement membrane.