FBN1 and congenital contractural arachnodactyly: The gene FBN2 has high similarity to FBN1; as a result, pathogenic variants in FBN2 have been reported to cause a phenotypically related disorder termed congenital contractual arachnodactyly (CCA) (MIM:121050) (Table 1), which also presents with Marfanoid body habitus and arachnodactyly [14,15,16].