Hypercalcemia with elevated dihydroxycholecalciferol levels and hypercalciuria. A parathyroid concentration-independent mechanism.

A 22-year-old man with renal stones had persistent hypercalcemia with massive idiopathic hypercalciuria due to a primary renal tubular phosphorus leak. He did not have hyperparathyroidism or sarcoidosis but did have an elevated dihydroxycholecalciferol level, which contributed to his hypercalcemia.