Genetic testing - Beals-Hecht syndrome ... (arachnodactyly contractural Congenital syndrome) - (See Arachnodactyly contractural congenital syndrome ...).

See:

Congenital contractural arachnodactyly; Beals-Hecht syndrome (Congenital contractural arachnodactyly, Beals-Hecht syndrome) - Gen FBN2.