Abstract

Polydactyly can be preaxial (radial), central, or postaxial (ulnar). Postaxial polydactyly can be a fully developed extra digit (type A) or a rudimentary extra digit (type B as shown).
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Polydactyly can be preaxial (radial), central, or postaxial (ulnar). Postaxial polydactyly can be a fully developed extra digit (type A) or a rudimentary extra digit (type B as shown).