Endocrine Abstracts

A 32-year-old woman with a nine-year history of right hip pain was admitted after she became unable to walk. Based on marked hypophosphatemia as indicated by serum phosphate of 1.4 mg/dl, intactPTH;29 pg/ml, TmP/GFR;1.14 mg/dl, and fibroblast growth factor 23 (FGF23) increased to 713 pg/ml, tumor-induced osteomalacia (TIO) was diagnosed. Systemic venous sampling of FGF23 performed for locating the tumor revealed an elevated level of 1600 pg/ml in the right femoral vein, and MR...