Fig. 1

Light microscopy and immunofluorescence microscopy findings. a–c Membranoproliferative glomerulonephritis with crescent formation. Neutrophils are present in the capillary lumens. (a: hematoxylin and eosin stain, b: periodic acid-Schiff stain, c: periodic acid methenamine silver stain); d–f staining for C3 (d), IgM (e) and weak staining for fibrinogen (f). (a–e: original magnification, 40×)