Mammary-digital-nail syndrome

What is Mammary-digital-nail syndrome?

Mammary-digital-nail syndrome is a syndromic limb malformation characterized by congenital onychodystrophy/anonychia, brachydactyly of the fifth finger, digitalization of the thumbs, with absence or hypoplasia of the distal phalanges of the hands and feet in association with juvenile hypertrophy of the breast with gigantomastia in peripubertal females.

Other condition names

  • MDN syndrome
  • Onycho-digito-mammary syndrome

Inheritance type

Autosomal dominant


  • Worldwide: <1 in 1,000 000

Age of Onset

  • Infancy
  • Neonatal
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