Kidney biopsy findings. Periodic Acid Schiff stain of a glomerulus showing double contours of the glomerular basement membrane (arrowhead), subtle margination of neutrophils, and hyalinosis (asterisk) of an adjacent arteriole (a, 400×); mucoid intimal edema was seen in arteries, occluding the lumen (b, 400×). Endotheliosis, thrombi, and mesangiolysis were not present.