• Internal medicine · Jan 2012

    Case Reports

    Fibroblast growth factor 23-related osteomalacia caused by the prolonged administration of saccharated ferric oxide.

    • Sunao Yamamoto, Yosuke Okada, Hiroko Mori, Seiji Fukumoto, and Yoshiya Tanaka.
    • The First Department of Internal Medicine, School of Medicine, University of Occupational and Environmental Health, Japan.
    • Intern. Med. 2012 Jan 1;51(17):2375-8.

    AbstractA 44-year-old woman with iron deficiency anemia was on a continuous course of intravenous saccharated ferric oxide (SFO). She came to our hospital because of right hip joint pain. She was found to have hypophosphatemia caused by impaired phosphorus resorption and her fibroblast growth factor 23 (FGF-23) levels were elevated. Therefore, she was diagnosed with FGF-23-related osteomalacia due to SFO administration. Discontinuation of the SFO treatment rapidly improved the impaired phosphorus resorption and also normalized the blood levels of phosphorus and FGF-23. During the treatment with SFO, it is important to regularly measure the blood levels of phosphorus in order to prevent the occurrence of osteomalacia.

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