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A 25-year-old female presents to the hospital with malaise and a creatinine of 3.5. She reports that she was in her normal state of health until about 2 weeks ago when she had the “flu.” The patient has minimal proteinuria and bland urine sediment. A kidney biopsy was obtained. Figure 1 shows a normal glomerulus. Figure 2 shows severe chronicity. Figure 3 and 4 show polyhedral clear crystals within the tubular lumina. Figure 5 shows an increased number of oxalate crystals under polarized light. Renal oxalosis is characterized by excess deposition of calcium oxalate crystals within the kidney. There are...