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Answer: True About 5-10% of the patients with monoclonal gammopathy and findings consistent with C3GN by standard IF (on frozen tissue) will actually have a Membranoproliferative GN with masked monoclonal deposits. These patients require additional IF studies to be performed on protease-digested, paraffin-embedded tissue for identification of the monoclonal immunoglobulin in the deposits. References: Leung N, et al. The evaluation of monoclonal gammopathy of renal significance: a consensus report of the International Kidney and Monoclonal Gammopathy Research Group. Nat Rev Nephrol 2019; 15(1): 45-59. Larsen CP, et al. Membranoproliferative glomerulonephritis with masked monotypic immunoglobulin deposits. Kidney Int 2015; 88(4): 867-873....