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  • Title: Ethmoid tumor and oncogenic osteomalacia: Case report and review of the literature.
    Author: Villepelet A, Casiraghi O, Temam S, Moya-Plana A.
    Journal: Eur Ann Otorhinolaryngol Head Neck Dis; 2018 Oct; 135(5):365-369. PubMed ID: 30026073.
    Abstract:
    INTRODUCTION: Oncogenic osteomalacia is a very rare disease usually caused by a phosphaturic mesenchymal tumor, particularly the "mixed connective tissue type", secreting FGF-23 hormone. OBJECTIVE: The authors report a case of ethmoid tumor associated with oncogenic osteomalacia and discuss management based on a review of the literature. CASE SUMMARY: A 41-year-old woman with multiple fractures causing major disability was diagnosed with early-onset osteoporosis. CT scan followed by MRI, performed due to the concomitant presence of nasal obstruction, showed a right ethmoid tumor in contact with the dura mater and periorbital tissues, but with no signs of invasion. Endoscopic resection was performed with reconstruction of the defect of the cribriform plate by a nasoseptal flap. Nasal and bone symptoms subsequently resolved. Histological examination revealed a phosphaturic mesenchymal tumor. DISCUSSION: Twelve cases of mesenchymal tumor of the ethmoid sinus associated with oncogenic osteomalacia have been reported to date. FGF-23 assay and whole-body MRI with STIR sequence are useful for the diagnosis. A very favorable outcome is observed after surgical treatment in the majority of cases.
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