A Paranasal Tumor Associated With Tumor-Induced Osteomalacia

Background: Tumor‐induced osteomalacia (TIO) is an extremely rare paraneoplastic syndrome associated with mesenchymal tumors in the craniofacial region. Methods: We treated a 24‐year‐old Japanese woman with paranasal sinus tumor and a low serum phosphate level who presented with nasal obstruction and systemic bone fractures. Serum fibroblast growth factor 23 (FGF‐23) was measured before and after surgery. Results: After surgery, her symptoms...