 Because most children with MPS I (Hurler Syndrome) also exhibit symptoms of a gibbus deformity, the latter can possibly be used to identify the former.Gibbus deformity is included in a subset of structural kyphosis that is distinguished by a higher-degree angle in the spinal curve that is specific to these forms of kyphosis.Other conditions within this subset include Pott's disease and Scheuermann kyphosis, but gibbus deformity is marked by an especially sharp angle.