of the altered gene is sufficient to cause the disorder. Management There is no treatment for the underlying condition. Supportive/symptomatic treatment is based on the traits present in each person with the condition. Notable people Michael Dunn, American actor, Tony winner, Wild Wild West, Star Trek Warwick Davis, English actor and TV presenter Lenny Rush, English actor References Spranger: Bone Dysplasias, Urban & Fischer 2002, Further reading GeneReviews/NIH/NCBI/UW entry on X-Linked Spondyloepiphyseal Dysplasia Tarda OMIM entries on X-Linked Spondyloepiphyseal Dysplasia Tarda External links Autosomal dominant disorders Collagen disease Rare diseases