Brachydactyly type B

What is Brachydactyly type B?

A rare congenital limb malformation syndrome characterized by hypoplasia or aplasia of the terminal parts of fingers 2 to 5, with complete absence of the fingernails. The thumbs are always intact but frequently show flattening, splitting or duplication of the distal phalanges. Digits on the radial side of the hand are less severely affected than those on the ulnar side. The feet are similarly affected but less severely. Soft tissue syndactyly, symphalangism, carpal and/or tarsal fusions and shortening of metacarpals and/or metatarsals may be present.

Inheritance type

Autosomal dominant

Prevalence

  • Worldwide: <1 in 1,000 000

Age of Onset

  • Antenatal
Orphadata: Free access data from Orphanet. © INSERM 1999. Available on "https://www.orphadata.com". Data version 1.3.16 / 4.1.7.