Case report shows a phosphaturic mesenchymal tumor in sinonasal tract, implying difficulty in diagnosing spindle cell tumors.
Phosphaturic mesenchymal tumours are rare neoplasms that cause tumour-induced osteomalacia through excess production of phosphatonins, most commonly FGF23. They are often morphologically bland, resemble other spindle cell tumours and are difficult to diagnose on limited biopsy.
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Sim et al. (2026) studied this question.
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