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Proliferative Glomerulonephritis With Hidden Monotypic IgG3κ Deposits: A Case Report
Satoru Kudose1, Ibrahim Batal1, John Lucia2
1Department of Pathology and Cell Biology, Columbia University Irving Medical Center, New York, New York.
Summary
Rare kidney disease cases with IgG-dominant glomerulonephritis may hide monotypic immunoglobulin deposits. New techniques reveal obscured IgG3-kappa deposits, suggesting a transformation and aiding diagnosis.
Area of Science:
- Nephrology
- Immunopathology
- Glomerular Diseases
Background:
- Immune complex-mediated glomerulonephritis (IC-GN) typically shows immunoglobulin (Ig) deposits.
- Rarely, IgG-dominant IC-GN lacks light chain restriction, suggesting obscured monotypic Ig.
Observation:
- A case initially presented as IgG-restricted IC-GN without light chain restriction.
- A subsequent biopsy showed transformation to IgG3-kappa proliferative glomerulonephritis with monotypic immunoglobulin deposits (PGNMID).
Findings:
- Advanced techniques, including heavy and light chain (HLC)-IF, revealed obscured monotypic IgG3-kappa deposits in the initial biopsy.
- Polytypic IgM deposits masked the monotypic IgG3-kappa in the first biopsy specimen.
Implications:
- This case suggests IgG-dominant IC-GN without light chain restriction may represent occult PGNMID.
- IgG subclass staining and HLC-IF are valuable for detecting obscured monotypic Ig in challenging glomerulonephritis cases.
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