Other treatments also have been reported, such as calcium-sensitive receptor agonist cinacalcet to induce hypoparathyroidism (11), octreotide receptor (12), anti-FGF23 antibody (13), and radiofrequency ablation (14), etc. However, most of these are from case reports and have mainly been used in cases where TIO is highly suspected but the tumor has not been located. Here, FGF23 is linked to hypoparathyroidism.