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polydactylies

MIM.603596

polydactyly

 

Polydactyly is defined as duplication of a finger or part of it. It occurs as an isolated malformation, in association with other malformations of the hands and/or feet, or as a part of a syndrome. Sporadic as well as familial occurrence have been described. In the latter it is usually inherited as an autosomal dominant trait. The prevalence of polydactyly with or without an associated malformation varies between 5 and 17 per 10,000 live births.

Types

-  preaxial polydactyly

-  central polydactyly (medial ray)
-  postaxial polydactyly (lateral ray)

Etiology

-  isolated polydactyly (postaxial hexadactyly ++)
-  syndromal polydactyly (in malformative syndromes)

References

-  Lettice LA, Hill RE. Preaxial polydactyly: a model for defective long-range regulation in congenital abnormalities. Curr Opin Genet Dev. 2005 Jun;15(3):294-300. PMID: #15917205#


Post-axial polydactyly

Pre-axial polydactyly

Hand post-axial polydactyly in a Meckel syndrome

Foot post-axial polydactyly in a Meckel syndrome

Foot post-axial polydactyly

Foot polysyndactyly

Polydactyly: supernumerary finger

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