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The patient is a 60-year-old male who presents with proteinuria, hematuria, and a creatinine of 2.8 mg/dL. He was in his normal state of health until 2 weeks ago when he noticed he was having trouble putting on his shoes. Serologies show low complements and an albumin of 2.3 g/dL. Serologies for ANA, c-ANCA, p-ANCA, hepatitis B, and hepatitis C are negative. No monoclonal spike is found on serum electrophoresis. Figure 1 shows accentuation of lobulation with both mesangial and endocapillary hypercellularity. This is a membranoproliferative pattern. Figure 2 shows a small, hyaline thrombus. Figure 3 shows moderate interstitial fibrosis....