Fig. 3

Renal biopsy findings. a The granulomatous angitis: cellular infiltrate around from interlobular arterioles to arteriolar vein was remarkable. There was diffuse involvement of perivascular granulomatous changes (long arrow) and eosinophilic infiltration (arrowheads). Scale bar, 20 μ0 (hematoxylin and eosin staining, × 200). b Necrotic lesion: fibrinoid necrosis was observed around the arteriole (arrow). Scale bar, 50 μ0 (Masson stain, × 200)