bifid thumb

bi·fid thumb

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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On physical examination, he had microcephaly, mild dysmorphic features like hypertelorism, retrognatia and antevert ears, unilateral bifid thumb, cryptorchidism and hypopigmented macule.
In subject III there was thumb hypoplasia and contralateral bifid thumb.
Construction of one good thumb from both parts of a congenitally bifid thumb.