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Preaxial polydactyly. This is a less common situation, in which the affectation is on the side of the hand towards the thumb. Radial polydactyly refers to the presence of an extra digit (or extra digits) on the radial side of the hand. It is most frequent in Indian populations and it is the second most common congenital hand disorder.
Familial opposable triphalangeal thumb duplication is a limb malformation syndrome and a type of pre-axial polydactyly, characterized by having duplicated opposable triphalangeal thumbs. This condition can be a symptom of other genetic disorders, such as Holt–Oram syndrome and Fanconi anemia .
Preaxial polysyndactyly, in which the duplicated digit is on the side of the thumb or big toe, is less common. [3] Crossed polysyndactyly, in which polysyndactyly is present on the hand and foot, and is preaxial on one and postaxial on the other, is extremely rare and often occurs with other genetic disorders. [6]
Polydactyly is a common congenital limb difference, occurring in about 1 in 500-1,000 live births. ... pre-axial (extra digit near the thumb/big toe), post-axial (extra digit near the little ...
This is characterized by hand and arm abnormalities. The following are specific characteristics: [citation needed] Malformed or absent thumb; A thumb that looks more like a finger; Partial or complete absence of a radius; Shortening and radial deviation of the forearms; Triphalangeal thumb; Duplication of the thumb (preaxial polydactyly)
The disease is not easily definable. The main form of diagnosis is presumptive, if the person has the usual triad of preaxial polydactyly with cutaneous syndactyly of at least one limb, macrocephaly, and hypertelorism. However, a definitive diagnosis can be made if there is a phenotype that is caused by a Gcps and a Gli3 gene mutation. It can ...
Polydactyly alopecia seborrheic dermatitis; Polydactyly cleft lip palate psychomotor retardation; Polydactyly myopia syndrome; Polydactyly postaxial dental and vertebral; Polydactyly postaxial with median cleft of upper lip; Polydactyly postaxial; Polydactyly preaxial type 1; Polydactyly syndrome middle ray duplication
Some individuals have preaxial polydactyly in the feet (unilateral in one, bilateral in 13), consisting of a small extra biphalangeal toe, in most cases with an associated rudimentary extra metatarsal, lying in a soft tissue web between the hallux and second toe.