Polydactyly is a condition where someone is born with one or more extra fingers or toes. It can occur on one or both hands or feet. The name comes from the Greek poly(many) and dactylos (finger). The extra fingers or toes are described as "supernumerary," which means "more than the normal number." For this reason, the condition is sometimes called supernumerary digit. A range of treatments is available depending on the type of polydactyly, and the cause is often genetic.
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