Vitamin D metabolite levels in oncogenic osteomalacia.

Measurements of 1,25 (OH)2D3 and other metabolites of vitamin D in a patient with oncogenic osteomalacia confirm the selective, reversible deficiency of 1,25 (OH)2D3 in this syndrome, and indicate the rapidity of normalization (within days) of the hormone level and associated hypophosphatemia after resection of the tumor. In this patient, the tumor was an intranasal hemangiopericytoma.