Fig. 3

The pathological findings of the second renal biopsy. a Light microscopic examination showed 30 glomeruli, of which three were globally sclerotic (PAM stain, ×400). b, c Light microscopic examination showed that the interstitial compartment was focally infiltrated with inflammatory cells composed of mainly plasma cells, lymphocytes, and a slight mixture of neutrophils. The extent of tubulointerstitial injury was ~ 50 % of the renal cortex (b hematoxylin-eosin stain, ×200; c Masson’s trichrome stain, ×40)