Fig. 2
a Light microscopy of the entire cross-section reveals abrupt transition from normal to atrophic cortex with lobar atrophy (Masson-trichrome staining, 4×). b Tubular atrophy, marked abnormal blood vessels with wall thickening (short arrow), gathered glomeruli, and parenchymal destruction are observed (Masson-trichrome staining, 20×). c Diffuse immature glomerulus with interstitial fibrosis is observed (Periodic acid-Schiff staining, 250×). d Fibromuscular tissue proliferation is observed around the renal calyx (Masson-trichrome staining, 40×). e, f Renin localized partially in the proximal tubules and the parietal epithelium of the Bowman’s capsule in the immature glomeruli (short arrow) (Renin antibody staining, 200×)