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A form of polydactyly, a condition defined by the occurrence of supernumerary digits in the upper and/or lower extremities. Preaxial or radial polydactyly refers to the presence of extra digits on the radial side of the hand. PPD4 is an autosomal dominant form characterized by mild duplication of the thumb, syndactyly of various degrees affects fingers 3 and 4, duplication of part or all of the first or second toes and variable toes syndactyly. Some patients have only foot involvement.




Polysyndactyly, uncomplicated
Type IV preaxial polydactyly


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