A proliferative glomerulonephritis secondary to a monoclonal IgA

Sandra M. Soares, Donna J. Lager, Nelson Leung, Eric N. Haugen, Fernando C. Fervenza

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


• A distinct entity mimicking immune-complex-mediated glomerulonephritis characterized by a proliferative glomerulonephritis with monoclonal immunoglobulin G (IgG) deposits recently was described. We now report a case of a 35-year-old woman who presented with sudden onset of edema, proteinuria, hematuria, and hypertension. Renal biopsy showed diffuse endocapillary proliferation, mesangial cellularity, and amorphous material in the mesangium. Immunofluorescence examination showed mesangial and capillary wall staining for IgA (2+), C3 (2+), fibrinogen (2 +), and λ (2+). Congo red stain was negative. Electron microscopy showed mesangial and subendothelial deposits with a paracrystalline lattice-like substructure forming parallel linear arrays. Extensive laboratory evaluation showed a small population of monoclonal plasma cells with λ restriction. The present case suggests that monoclonal IgA deposits also can cause proliferative glomerulonephritis. However, the presence of paracrystalline deposits in association with monoclonal IgA deposits has not been described previously.

Original languageEnglish (US)
Pages (from-to)342-349
Number of pages8
JournalAmerican Journal of Kidney Diseases
Issue number2
StatePublished - Feb 2006


  • Crystals
  • Glomerulonephritis
  • Immunoglobulin A (IGA)
  • Monoclonal

ASJC Scopus subject areas

  • Nephrology


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