Fig. 1

Renal biopsy findings. a A light microscopy showing a glomerulus with nodular lesions, duplication of the glomerular capillary wall (arrows) and expansion of the subendothelial space (arrowhead) (periodic acid-Schiff stain, original magnification × 500). b Mesangiolysis (arrow) in the glomerulus (periodic acid-Schiff stain, original magnification × 800). c Immunofluorescence staining for IgG showing linear pattern along the glomerular capillary walls (original magnification × 400). d Electron microscopy showing expansion of the subendothelial space with fibrin tactoids (arrowheads) and platelet (arrow) (original magnification × 4000)