Figure 1: A: The specimen of the kidney biopsy in the study patient, displaying glomerular, tubular and interstitial structural abnormalities (Masson's trichrome, original magnification ×40). Figure 1: B: A glomerular lobular pattern with numerous "double contours", proliferation of resident cells, and immigration of inflammatory cells. A tubular microcyst is conspicuous (periodic acid-Schiff (PAS), original magnification ×150). Figure 1: C: (a): Thickened basement membranes with numerous double contours and immune deposits. Figure 1: C: (b): Dense immune deposits in immersion oil (white arrow) (Jones mathanamine stain with Masson's trichrome). Figure 1: D: Focal and segmental necrotizing changes and wire loops (Masson's trichrome, original magnification ×150). Figure 1: E: Subepithelial spikes (Jones silver stain, original magnification ×600). Figure 1: F: A glomerular capillary thrombus (arrow) (Jones silver stain ×375).