Foot polydactyly Preaxial foot polydactyly HP:0009607 Preaxial polydactyly of the feet HP:0010050 Preaxial polydactyly, feet This term applies for a wide variety of partial and/or complete duplications of the phalanges of the big toe (sometimes including the 1st metatarsal). A partial duplication can present itself on x-rays as a notched phalanx, bifid phalanx or a broadened phalanx. Polydactyly affecting the big toe is called preaxial or hallucal polydactyly of the feet. UMLS:C1866339 Duplication of all or part of the first ray. Polydactyly affecting the hallux HP:0001841 UMLS:C2112942 Preaxial hallucal polydactyly Partial/complete duplication of the phalanges of the big toe Preaxial polydactyly of feet Preaxial polydactyly of foot