Abstract

Figure 1. A kidney biopsy in a 34-year-old man with IgA nephropathy showed mesangial-cell proliferation and predominant mesangial IgA deposition. At the time of the biopsy, the patient's serum creatinine and blood urea nitrogen levels were 1.3 mg per deciliter (110 μmol per liter) and 13 mg per deciliter (4.6 mmol per liter), respectively. Microscopical examination of the urine revealed many dysmorphic urinary erythrocytes with spheroid surface protrusions (Panel A, ×1450) indicative of glomerular hematuria. A glomerular erythrocyte ghost (Panel B, ×3250) has a small neck at the base of each surface protrusion, demonstrating its connection with the cytoplasm of . . .

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