Fig. 1. (A) Crescentic glomerulus was observed in the renal biopsy and size of glomerulus was markedly enlarged (Periodic acid-Schiff, Hematoxylin-Eosin stain, ×200). (B) Linear infiltration of IgG was shown along the glomerulus basement membrane (GBM). (C) Ruptured GBM was observed by electron microscopy (×5,000).