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Postaxial polydactyly is common in the hands and preaxial polydactyly in the feet.
2008, “Most Fingers and Toes — Living Person”, in Guinness World Records, Human Body — Extreme Bodies:
Pranamya Menaria (India; born August 10, 2005) has 25 in total (12 fingers and 13 toes). This is as a result of the condition Polydactyly and Syndactyly.
2021, Leah W. Burke, “3: Genetics of Associated Syndromes”, in Donald R. Laub Jr., editor, Congenital Anomalies of the Upper Extremity, Springer, page 42:
The rare polydactylies, that is, not clearly only postaxial or only preaxial, are the most likely to be associated with an underlying syndrome.
2023, Christianne van Nieuwenhoven, Steven Hovius, “9: Thumb Polydactyly”, in Giorgio Pajardi, editor, Pediatric Hand Surgery, Springer, page 102:
Polydactyly with a triphalangeal thumb will be described in the chapter on the triphalangeal thumb.[…]The incidence of polydactyly depends on the population studied and the definition used. Region, ethnicity and combined numbers of all polydactylies, or only radial or ulnar-sided polydactyly, provide very different incidences in published series.
