Abstract

A 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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