Presentation of Case A 76-year-old retired nurse was admitted to the hospital because of hypercalcemia. She was well until 17 years earlier, when she entered another hospital because of renal disease. The creatinine was 4.3 mg per 100 ml (380 μmol per liter). Transient hypercalciuria was noted; the serum calcium was not elevated. Microscopical examination of a renal-biopsy specimen was reported to show interstitial nephritis. Her renal function gradually improved, with decrease of the creatinine to 2.2 mg per 100 ml (200 μmol per liter). The phosphorus level was not elevated. Sixteen years before admission she was seen at this. . .
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