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Polydactyly

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syndactyly - congenital hand differences - Boston Children's Hospital

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thumb duplication - congenital hand differences - Boston Children's Hospital

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Jaxon's New Thumb

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Congenital Anomaly "Polydactly"

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10 Celebrities With Physical Deformities

Polydactyly or polydactylism, also known as hyperdactyly, is a congenital physical anomaly in humans and animals resulting in supernumerary fingers and/or toes. Polydactyly is the opposite of oligodactyly.