Fig. 1

a Light microscopy: Marked mesangiolysis was seen in all glomeruli. An unanchored dilated capillary had developed as result of the mesangiolysis (arrow). No fibrin or platelet thrombi were observed in the capillary lumina (Periodic acid-methenamine-silver stain, × 400). b Electron microscopy: Widening of the subendothelial space and swelling of the endothelial cells resulted in thickening of the capillary wall, leading to narrowing of the capillary loop. Extravasations of red blood cells to the subendothelial space were seen. (× 5750)