Fig. 1

Kidney histology. a Light microscopy, Masson’s trichrome staining, × 40. There was a diffuse augmentation of mesangial material and mesangial hypercellularity in all glomeruli, and a thickening of the glomerular basement membranes. Thrombi were present in the intraglomerular capillaries and in vessels of the intra juxtaglomerular apparatus. b Light microscopy, silver staining, × 60. Thickening of the capillary wall with a duplication aspect of the glomerular basement membrane. c Light microscopy, silver staining, × 40. Thrombi were present in vessels of the intra juxtaglomerular apparatus and in the arterioles. d Immunofluorescence, IgM staining, × 60. Mild glomerular capillary wall IgM deposits