Expansion of craniofacial lesions may lead to progressive facial deformity. In rare cases patients may develop vision and/or hearing loss due to compromise of the optic nerves and/or auditory canals, which is more common in patients with McCune-Albright syndrome associated growth hormone excess.[5] Fibrous dysplasia commonly involves the spine, and may lead to scoliosis, which in rare instances may be severe.[6] Untreated, progressive scoliosis is one of the few features of fibrous dysplasia that can lead to early fatality.