Hereditary index finger polydactyly: phenotypic, radiological, dermatoglyphic, and genetic findings in a large family.

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Abstract
Index finger polydactyly in a Turkish family is reported. The transmission of the malformation fits the pattern of regular autosomal dominant inheritance. Some of the affected individuals had 1 or 2 phalanges on their 1st digits, but all had triphalangeal 2nd fingers. Subjects with polydactyly had very interesting dermatoglyphs, such as an extra a triradius under the supernumerary index finger, the proximal radiant of this triradius (an extra A-line) ending on the radial border of the hand, and arch tibials in the hallucal areas. The carpal bones, beginning with os multangulum majus, or alternatively with the extra 1 were articulated with 2 metacarpals. A similar finding was found in the feet.

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