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Polydactyly of a biphalangeal thumb
Polydactyly of a biphalangeal thumb or PPD1 is the most common form of preaxial polydactyly of fingers (see this term), 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.
ORPHA:93339Classification level: Disorder