Renal amyloidosis as a late complication of Crohn's disease: a case report and review of the literature from Japan

Figure 4 Findings of the renal biopsy. A: Histological findings (hematocylin and eosin). Amorphous, eosin-stained deposits were seen in the mesangial areas. B: Histological findings (Congo red stain). The deposits were Congo red positive. Congo red stain showed reddish pink deposits that demonstrated apple-green birefringence when examined under polarized light. C: Electron microscopic findings. Fine fibrils (8 to 10 nm in diameter) arranged randomly or in bundles were found in the mesangium.