Fig. 1

Kidney biopsy findings. A Appearance of glomeruli was essentially normal. Mild tubular atrophy, mild interstitial edema, inflammation and fibrosis in interstium, arteriole hyalinosis was observed (PAS stain, × 200). B No mesangial expansion and hypercelluarity was observed (PAS stain, × 400). C No mesangial matrix accumulation was observed and width of mesangium was normal (Electron microscopy, magnification × 3000). D No electron-dense deposit was found, the thickness of glomerular basement membrane (GBM) was normal (343 nm ~ 405 nm, average 382 nm), and footprocess of podocyte was widespreadly effaced (Electron microscopy, magnification × 6000)