FGF23 and hypophosphatemia: Additionally, other rare disorders may manifest as FGF23-mediated hypophosphatemia, including osteoglophonic dysplasia, McCune–Albright syndrome, epidermal nevus syndrome, neurofibromatosis, hypophosphatemic rickets with hyperparathyroidism and Jansen metaphyseal chondrodysplasia [27,28,29,30,31,32].