Abstract
Light chain deposition disease (LCDD) is a form of monoclonal gammopathy of renal significance. The diagnosis is based on the immunofluorescence (IF) findings of linear monoclonal light chain staining of basement membranes throughout the kidney, which appear as non-organized, granular punctate to powdery electron dense deposits by electron microscopy (EM). Although “LCDD by IF only” without EM deposits has been well-described, LCDD identified by EM with negative IF is very rare and hardly mentioned in the literature. Herein we describe a case of lambda-type LCDD that appeared negative by IF and showed light microscopic findings of nodular glomerulosclerosis, which was initially attributed to the patient’s history of significant tobacco use and uncontrolled hypertension. However, EM later showed powdery electron dense material in focal glomerular and tubular basement membranes and mesangium. Subsequent bone marrow analysis revealed greater than 60% lambda-restricted plasma cells. We report this case to illustrate that within the differential diagnosis of nodular sclerosis, monoclonal immunoglobulin deposition disease (MIDD) should remain in the differential even if immunofluorescence appears negative as EM can prove to be crucial in identifying cases of MIDD.
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The authors are grateful to Karen Vanderbilt and Tracy Fontaine-Matteson for excellent technical support.
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AS and HYC wrote the first draft of the manuscript. RG, FP, BG critically revised the work. All authors read and approved the final manuscript.
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Alom, M., Grewal, R., Passero, F.C. et al. Light chain deposition disease masquerading as smoking-associated nodular glomerulosclerosis with deposits identified by electron microscopy only. CEN Case Rep 11, 448–452 (2022). https://doi.org/10.1007/s13730-022-00698-y
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DOI: https://doi.org/10.1007/s13730-022-00698-y