We report the case of a white woman with bilateral renal calculi that were removed by bilateral nephrolithotomies. The morphology of renal tubular stones and the changes in papillary tissue were studied by light microscopy and scanning and transmission electron microscopy. The stones were made of calcium oxalate and were intratubular. Large calcium phosphate deposits were present in the interstitium. There was a marked interstitial fibrosis and tubular epithelial hyperplasia.
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