A case of membranoproliferative glomerulonephritis associated with curved fibril deposition

作者：Narita Ikuyo^*; Shimada Michiko; Fujita Takeshi; Murakami Reiichi; Nakamura Masayuki; Nakamura Norio; Yamabe Hideaki; Okumura Ken

来源：BMC Nephrology, 2015, 16(1): 151.

DOI：10.1186/s12882-015-0147-9

• Membranoproliferative glomerulonephritis
• Fibrillary glomerulonephritis
• Immunotactoid glomerulopathy

Background: It is sometimes challenging to diagnose unsusual cases of fibrillary glomerulonephritis (FGN) and immunotactoid glomerulopathy (ITG), the rare causes of nephrotic syndrome.
Case presentation: A 75-year-old Japanese woman presented with nephrotic syndrome, microhematuria and renal insufficiency. Renal biopsy revealed membranoproliferative glomerulonephritis (MPGN) with IgM and weak C3 deposition. Congo red stain was negative. Electron microscopy demonstrated massive fibrils in the subendothelium, mesangium and subepithelium. The fibrils were partially parallel, partially curved and 17 nm in diameter. Cryoglobulin, hepatitis B virus (HBV) antigen, hepatitis C virus (HCV) antibody or antinuclear antibody were negative.
Conclusion: We report a case of MPGN associated with peculiar non-amyloid fibril deposition corresponding to neither FGN nor ITG.

• 出版日期2015-9-15