Thumb, Triphalangeal


Thumb, Triphalangeal

Objective: A thumb with three phalanges in a single, proximo-distal axis


The requirement for a single PD axis relates to the issue that partial forms of Preaxial polydactyly may comprise a partially duplicated thumb with two distal phalanges and a single proximal phalanx. That finding is instead coded as a mild form of thumb polydactyly. Note that this finding can be readily assessed by examination and/or physical manipulation of the thumb.


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