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June 28, 2018

Light Chain Deposition Disease

The immunofluorescence in cases of monoclonal immunoglobulin deposition disease is characterized by linear tubular basement membrane staining. In these cases, the positive staining is restricted to the monoclonal immunoglobulin leading to disease. The photomicrographs here show strong staining for kappa compared to lambda in a case of kappa light chain deposition disease. There is also commonly staining of the interstitium, vessels, and glomeruli. When the monoclonal immunoglobulin is a heavy chain, the immunofluorescence shows strong staining for the depositing heavy chain with little to no staining for either light chain.