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A 57-year-old white male presents with fatigue, mild proteinuria, and a creatinine of 1.5 mg/dL. He was diagnosed with lymphoplasmacytic lymphoma 6 months ago, but refused treatment. Figures 1 & 2 show prominent pseudothrombi and a membranoproliferative pattern of glomerular injury. Image 3 shows moderate interstitial fibrosis. Image 4, 5, 6, & 7 show IgG, IgM, kappa, and lambda, respectively. This is a case of cryoglobulinemic glomerulonephritis secondary to lymphoplasmacytic lymphoma (Waldenström's macroglobulinemia). Waldenström's macroglobulinemia is a rare B-cell lymphoma characterized by lymphoplasmacytic cell infiltration in the bone marrow and other organs and the presence of a monoclonal immunoglobulin M...