Case Reports in Oncology (Apr 2025)

Fibrillary Glomerulonephritis and Multiple Myeloma: A Case Report and Literature Review

  • Taiki Ishida,
  • Ken Morita,
  • Yosuke Masamoto,
  • Hideaki Mizuno,
  • Kazuki Taoka,
  • Hiroyuki Abe,
  • Motoki Odawara,
  • Yosuke Hirakawa,
  • Masaomi Nangaku,
  • Mineo Kurokawa

DOI
https://doi.org/10.1159/000545498
Journal volume & issue
Vol. 18, no. 1
pp. 554 – 562

Abstract

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Introduction: Fibrillary glomerulonephritis (FGN) is a rare form of immune complex-mediated primary glomerular disease frequently coexisting with malignancies or autoimmune diseases. The kidney prognosis is extremely poor, with approximately 50% of patients progressing to end-stage kidney disease within 2–4 years after diagnosis. However, no established treatment currently exists. Case Presentation: Here we describe a rare case of FGN diagnosed in a patient progressing from monoclonal gammopathy to multiple myeloma. The histopathological findings of the kidney biopsy were consistent with classical FGN and revealed no evidence of myeloma cast nephropathy. Albumin-dominant, Bence Jones protein-negative proteinuria further supported this diagnosis. The patient was successfully treated with anti-myeloma chemotherapies including autologous stem cell transplant, resulting in significant improvement in kidney function. Conclusion: Based on our experience, secondary FGN associated with plasma cell neoplasms may represent a rare entity that responds favorably to anti-myeloma therapies. Initial investigations to rule out coexistent plasma cell neoplasms are crucial for the optimal management of FGN patients.