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Start free with EleplanPolydactyly of a biphalangeal thumb and/or hallux
ORPHA:93339Morphological anomaly
Also called PPD1 · Preaxial polydactyly type 1
What it is
A rare non-syndromic limb malformation characterized by the duplication of one or more skeletal components of a biphalangeal thumb and/or hallux. Hands are preferentially affected (in bilateral), and the right hand is more commonly involved than the left. Hallux duplication may present concomitantly to, or independently of thumb polydactyly and is predominantly unilateral right.
Key facts
- Age of onset
- Infancy, Neonatal
- Inheritance
- Autosomal dominant
- Classified as
- Morphological anomaly
Gene
ICD-10 codes
ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.
Cross-references
Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.
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