Polydactyly of a biphalangeal thumb
Polydactyly of a biphalangeal thumb
Definition
Polydactyly of a biphalangeal thumb or PPD1 is the most common form of preaxial polydactyly of fingers, a limb malformation syndrome, that is characterized by the duplication of one or more skeletal components of a biphalangeal thumb. Hands are preferentially affected (in bilateral), and the right hand is more commonly involved than the left.
Also known as polydactyly, preaxial type 1, PPD1, preaxial polydactyly type 1 — per MONDO