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Postaxial polydactyly. This is the most common situation, in which the extra digit is on the ulnar side of the hand, thus the side of the little finger. This can also be called postaxial polydactyly. It can manifest itself very subtly, for instance only as a nubbin on the ulnar side of the little finger, or very distinctly, as a fully developed ...
The syndrome was originally described by American and Canadian geneticists Philip Pallister and Judith Hall in their research of newborn deaths due to pituitary failure. [3] Subsequent discovery of living children and adults expanded the understanding of the syndrome and established the transmission pattern within families.
Young–Madders syndrome, alternatively known as Pseudotrisomy 13 syndrome or holoprosencephaly–polydactyly syndrome, is a genetic disorder resulting from defective and duplicated chromosomes which result in holoprosencephaly, polydactyly, facial malformations and intellectual disability, with a significant variance in the severity of symptoms being seen across known cases. [1]
Bardet–Biedl syndrome is a pleiotropic disorder with variable expressivity and a wide range of clinical variability observed both within and between families. The most common clinical features are rod–cone dystrophy, with childhood-onset night-blindness followed by increasing visual loss; postaxial polydactyly; truncal obesity that manifests during infancy and remains problematic ...
Polysyndactyly is a congenital anomaly, combining polydactyly and syndactyly, in which affected individuals have an extra finger or toe that is connected, via fusing or webbing, to an adjacent digit. [ 1 ] [ 2 ]
The hands are the most affected part of the upper limb. [9] Although all metacarpals (bones of the hand) are present, they are relatively short. [ 9 ] Some individuals may have an extra finger on both hands, a condition called bilateral postaxial polydactyly . [ 10 ]
Ostravik-Lindemann-Solberg syndrome, also known as heart defect-tongue hamartoma-polysyndactyly syndrome is a rare, multi-systemic genetic disorder which is characterized by congenital heart defects, tongue hamartomas, postaxial polydactyly of the hand, and syndactylism of the foot.
Ulnar dimelia, also referred to simply as mirror hand, is a very rare congenital disorder characterized by the absence of the radial ray, duplication of the ulna, duplication of the carpal, metacarpal, and phalanx bones, and symmetric polydactyly.