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bifid thumb

 

Definition: a congenital malformed thumb where the distal phalanx is divided. preaxial duplication that may occur at any level; most common type involves two duplicated proximal phalanges supported by a bifid metacarpal head. Bifid thumb occurs most commonly in Asians, less commonly in whites, least commonly in African–Americans.

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© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
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