A 15-year-old boy was treated for nonfamilial hypophosphatemic rickets. Treatment with ergocalciferol, 100,000 units/day, and phosphorus, 2 to 4 g/day, failed to alleviate the rickets. Levels of 1α,25-dihydroxyvitamin D were low while levels of 25-hydroxyvitamin D were elevated. After removal of a benign fibroma, the level of 1α,25-dihydroxyvitamin D increased, the serum phosphorus level became normal, and the osteomalacia was cured. The alteration of vitamin D metabolism and associated hypophosphatemia in oncogenic osteomalacia is a potentially reversible cause of bone disease mediated by the tumor.
Parker MS, Klein I, Haussler MR, Mintz DH. Tumor-Induced OsteomalaciaEvidence of a Surgically Correctable Alteration in Vitamin D Metabolism. JAMA. 1981;245(5):492–493. doi:10.1001/jama.1981.03310300046018
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