For example, arachnodactyly, scoliosis, pectus deformity, and OA are features of STL1; however, tall stature, dolichocephaly, dolichostenomelia, malar hypoplasia, feet deformitiy, and dural ectasia have not been associated with this syndrome (Table 2)3,36. The gene discussed is COL2A1; the disease is Disproportionate tall stature.