Case Report: A Rare Case of Lupus Nephritis Associated With Mantle Cell Lymphoma

Here we described a very rare case of secondary lupus nephritis associated with B-cell lymphoma. An 84-year-old man was hospitalized at our institute for lower extremity edema persisting for over 2 months. He was diagnosed with systemic lupus erythematosus based on clinical and laboratory criteria, who showed impaired renal function and nephrotic syndrome with predominant hematuria. Renal biopsy showed IV+V lupus nephritis with highly infiltrated lymphoid cells in the kidney. Secondary lupus nephritis was suspected based on possible pathogenesis of glomerular injury due to mantle cell lymphoma. Low-dose dexamethasone, Rituximab and lenalidomide were started immediately on this patient and his renal function was improved after first cycle chemotherapy.