Alternative definition : NICHD: A group of sclerosing bone dysplasias characterized by pronounced sclerosis
of the cranial vault and the long bones, resulting in increased cortical bone density.
Most cases are caused by mutation(s) in the SOST or LRP5 genes, encoding sclerostin
and low-density lipoprotein receptor-related protein 5, respectively. Other genes
have been implicated, and some cases have been described, but do not yet have identified
genetic mutations.;