This is a rare condition, in which the extra digit is on the ring, middle or index finger. Of these fingers, the index finger is most often affected, whereas the ring finger is rarely affected.This type of polydactyly can be associated with syndactyly, cleft hand, and several other syndromes.Polysyndactyly presents various degrees of syndactyly affecting fingers three and four.

Causes

Polydactyly is associated with different mutations, either mutations in

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