Figure legends :
Figure 1 : Mesangial fibrosis with mesangiolysis and reduction
of the lumen of glomerular capillaries (Trichrome stainingx40).
Figure 2 : Segmental fibrinoid necrosis in a glomerulus
(Trichrome stainingx40).
Figure 3 : Onion bulb appearance in medium-caliber vessels
(Trichrome stainingx40)