(a)
(b)
(c)
(d)
Figure 2: (a) Fibrocellular crescent in Bowman’s space with significant collapse of glomerular tufts and the presence of glomerular-fibrinoid necrosis (Masson-trichrome stain). (b) GBM thickening including spike and bubbling formations in the subepithelial lesions (PAM stain). (c) Granular staining for IgG along glomerular capillary walls (IgG immunofluorescence stain). (d) Electron-dense deposits in the subepithelial lesions (electron microscopy).