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Myeloid bodies in drug‐induced acute tubular necrosis

A growing list of drugs, metals, and chemicals has been implicated as the cause of functional and structural damage specifically to the proximal tubular epithelium. Renal biopsies were obtained from three patients who had developed nephrotoxic agent‐related acute renal failure. Two of the patients had received gentamicin and viomycin; the third patient had heavy exposure to chromium. All three biopsies showed acute tubular necrosis (ATN) on light microscopy. Electron microscopy revealed that the proximal tubular cells and, to a lesser degree, the distal tubular cells, contained abundant, variably sized myeloid bodies. In our previous experimental study of viomycin‐induced ATN in rats, similar ultrastructural findings of a gradual increase in the number of myeloid bodies in the proximal tubular cells were also observed.