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An 80-year-old white male presents with a creatinine of 4.2 (baseline 1.1) on routine lab examination. His medical history is significant for coronary artery disease, aortic valve replacement, hypertension, and peripheral artery disease. He reports no episodes of dehydration and reports that he has been in his normal state of health. Figure 1 shows a normal glomerulus. Figure 2 shows a mild interstitial fibrosis. Figure 3 shows brown spherules within the tubular epithelial cells. Figure 4 confirms the presence of iron within these brown spherules. This is a case of renal hemosiderosis. The presence of iron deposits speaks towards intravascular...