Various modalities have been used to detect the lesions responsible for oncogenic osteomalacia, including CT, MR, whole-body 99mTc-sestamibi scan111, octreotide scintigraphy,201 TI scintigraphy, 99mTc-MIBI SPECT, and venous sampling for FGF23 with MR imaging.10 Hypophosphatemic osteomalacia may be evident when the tumor has already become obvious as happened in all our three cases. The gene discussed is FGF23; the disease is osteomalacia.