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[Light chain deposition disease]
E Terzani1, B Alterini, M Doni
1Divisione di Medicina Interna IV, Policlinico di Careggi, Firenze.
Insights
This case study details a rare K-light chain deposition disease (LCDD) in a patient with hypertension and kidney disease. Treatment with melphalan and prednisone stabilized renal function, offering insights into managing this condition.
Area of Science:
- Nephrology
- Hematology
- Pathology
Background:
- Monoclonal immunoglobulin deposition diseases (MIDD) are rare disorders characterized by the deposition of immunoglobulin light or heavy chains in organs.
- K-light chain deposition disease (LCDD) is a subtype of MIDD, often affecting the kidneys and leading to progressive nephropathy.
Observation:
- A 61-year-old male with hypertension presented with rapidly progressing nephropathy.
- Renal and liver biopsies confirmed LCDD with K-light chain deposits in the glomeruli and tubules.
- Bone marrow examination showed lymphoid infiltration positive for K-light chain staining.
Findings:
- The patient exhibited hepatic and urinary K-light chains but no circulating light chains.
- Kidney biopsy revealed nodular glomerulosclerosis and extensive tubular involvement.
- No evidence of liver dysfunction or amyloidosis was found in the kidney, liver, or bone marrow.
Implications:
- This case highlights a rare presentation of LCDD and its diagnostic confirmation through biopsy.
- Therapy with melphalan and prednisone appeared to stabilize renal function over one year.
- Understanding the physiopathology of light chain MIDD is crucial for effective patient management and treatment strategies.
Abstract:
We report the case of a rather rare form of K-light chain deposition disease (LCDD) in a 61-year-old man with hypertension and rapidly progressing nephropathy. Laboratory findings prompted suspicion of the diagnosis which was confirmed by light-microscopic and immunofluorescent studies of samples taken by percutaneous renal and liver biopsy. Hepatic and urinary K-light chains were present; no circulating light chains were detected. Bone marrow examination evidenced mild infiltration of lymphoid cells, all positive for K-light chain staining. Plasma cells were within normal ranges. LCDD appeared as nodular glomerulosclerosis with rare crescents and extensive tubular involvement with K-light chain deposits. There was no evidence of altered liver function, nor was amyloid found in the bone marrow, kidney or liver. After one year of continuous therapy with melphalan and prednisone, the patient's renal function has not worsened. We conclude with a review of the clinical and physiopathological features of the light chain subgroup of monoclonal immunoglobulin deposition diseases (MIDD).