Full-house nephropathy associated with mantle cell lymphoma.

An 82-year-old man was admitted to our hospital with edema on the upper and lower extremities that had worsened over the past 5 months. He was diagnosed with nephrotic syndrome and acute renal failure. A computed tomography evaluation revealed generalized lymphadenopathy and splenomegaly. A bone marrow biopsy confirmed the diagnosis of mantle cell lymphoma (MCL). A renal biopsy showed full-house nephropathy with diffuse global endocapillary proliferation and electron-dense deposits in the epithelial, endothelial, and mesangial areas. Lymphoma cells infiltrated the renal interstitium but were not observed within the glomeruli. The blood test demonstrated low complement levels, positive anti-single-stranded deoxyribonucleic acid antibody and anti-double-stranded deoxyribonucleic acid antibody, but negative for antinuclear antibody; no other physical findings consistent with systemic lupus erythematosus were observed. After the initiation of the treatment for MCL, the renal function and urinary protein level improved. The patient was diagnosed with immune complex-associated glomerulonephritis, resembling lupus nephritis, secondary to MCL.