Membranous glomerulopathy in a patient with sarcoidosis

Area of Science:

• Nephrology
• Immunology
• Pulmonology

Background:

• Sarcoidosis is a multisystem inflammatory disease that can affect various organs, including the lungs, spleen, and liver.
• Membranous nephropathy is a kidney disease characterized by immune complex deposition in the glomeruli, leading to proteinuria.
• The co-occurrence of sarcoidosis and membranous nephropathy is rare, prompting investigation into a potential relationship.

Observation:

• A patient with pulmonary, splenic, and hepatic sarcoidosis presented with significant proteinuria (over 8.0 gm/100 ml daily) but remained asymptomatic with no edema.
• Initial treatment with prednisone resolved the pulmonary and splenic manifestations of sarcoidosis.
• Despite prednisone therapy, proteinuria persisted, although diminished.

Findings:

• Adjunctive therapy with cyclophosphamide led to a further reduction in proteinuria.
• The case suggests a potential causal relationship between sarcoidosis and the development of membranous nephropathy.
• The patient's response to immunosuppressive therapy highlights the inflammatory basis of the observed nephropathy.

Implications:

• This case expands the understanding of sarcoidosis-associated renal complications.
• It suggests that sarcoidosis may directly contribute to the pathogenesis of membranous nephropathy.
• Further research is warranted to elucidate the mechanisms underlying this association and optimize treatment strategies.