triphalangeal thumb

Triphalangeal thumb is considered a form of pre-axial polydactyly.

Epidemiology

Triphalangeal thumbs have an incidence of 1 in 25,000 .

Pathology

A triphalangeal thumb, as the name implies, has three phalanges instead of the usual two. There is an autosomal dominant genetic transmission .

Associations

There is a long list of associations :

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