Hypophosphatemic osteomalacia induced by FGF23-secreting tumor of the left femur

Tumor-induced hypophosphatemic osteomalacia is a rare disease and its diagnosis presents certain difficulties. This is primarily due to small tumor size and to the absence of local clinical symptoms. Adult-onset newly diagnosed hypophosphatemia concurrent with hyperphosphaturia is a sign of tumor-induced hypophosphatemic osteomalacia. The paper describes a female patient with fibroblast growth factor 23-secreting tumor of the upper third of the femur. After tumor removal, pharmacological treatment involves prescribing calcium supplements and active vitamin D metabolite until normal bone mineral density is restored