Fig. 1

Light and Electron micrographs of biopsy kidney specimen from the patient. A Amyloids deposit in the interstitium. Periodic Acid-Schiff stain × 400, B Amyloids deposit in afferent arteriole and some mesangial area. Erythrophilic complex deposits on the epithelial side. Masson stain × 400, C, D Congo red-positive amyloid deposits, with apple-green birefringence, seen in the mesangial area and interstitium. C Congo red × 400, D Congo red under polarized light microscopy × 400, E Subepithelial electron-dense deposits with intervening “spikes” and Amyloid fibrils found in subendothelial spaces. EM × 30,000, F Amyloid fibrils found in interstitial area. EM × 7500/ × 90000