 Congenital contractural arachnodactyly may be the result of new mutations in the "FBN2" gene or it may be inherited from a parent in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder.CCA may be diagnosed through the physical characteristics associated with the disease of long, slender body and contractures of multiple joints, as well as other symptoms, such as muscular hypoplasia.Molecular genetic tests may be run using sequence analysis or deletion/duplication analysis to look for mutations in the "FBN2" gene.