Successful treatment with denosumab for two cases with hypercalcemia due to vitamin D intoxication and associated acute kidney injury.

Hypervitaminosis D is a rare reason for hypercalcemia and associated with acute kidney injury. We report on two cases of hypercalcemia and acute kidney injury because of vitamin D intoxication successfully treated with denosumab. Case 1 is an 83-year-old woman, who was initially treated for 2 weeks with intravenous hydration, steroids and thereafter with furosemide without any effect on serum calcium levels and renal function. Because acute renal failure discouraged us to use intravenous bisphosphonate therapy, we applicated 60 mg denusomab subcutaneously. This led to a prompt reduction in serum calcium levels and improvement of renal function within 1 week. Case 2 is a 45-year-old athletic woman, who refused the standard therapy of steroids and forced diuresis for vitamin D intoxication. After 1 day of rehydration therapy, she received 60 mg denusomab. Similar to case 1 serum calcium declined and renal function improved within 7 days.