Endocrine Abstracts

Tumor-induced osteomalacia (TIO) or ‘oncogenic osteomalacia’ is a rare paraneoplastic disorder, usually resulting from Fibroblast Growth Factor 23 (FGF23) oversecretion by a benign small ‘phosphaturic mesenchymal tumor’, causing hypophosphatemia and reduced 1,25-dihydroxyvitamin D synthesis. Calcium and parathyroid hormone (PTH) levels are usually normal, but secondary/tertiary hyperparathyroidism has been reported in up to 5% of the cases, mainly due to 1,...