IS Case 556: Polydactyly of the hand
Imaging Sciences URMC 2010
Publication Date: 2010-09-25
Patient is a 6-month-old boy with polydactyly.
Polydactyly of the hand
Polydactyly is the most common congenital anomaly of the hand. The incidence of polydactyly is higher in African Americans compared to white people. It is more common in males than females. Polydactyly can occur as an isolated anomaly or can occur as a part of a syndrome. Isolated polydactyly has an autosomal dominant inheritance. About 15% of polydactyly cases are associated with other congenital anomalies. The common syndromes associated with polydactyly are Down syndrome and trisomy 13.
Temtamy and McKusick classified polydactyly into pre-axial, central and post-axial polydactyly. Pre-axial refers to duplication of the first digit, central refers to duplication of the second, third or fourth digits and post-axial refers to duplication of the fifth digit.
- Abel CG, McCarthy DM. Supernumerary digit. eMedicine, Jul 31, 2008. http://emedicine.medscape.com/article/1113584-overview
- Castilla EE, Lugarinho R, da Graça Dutra M, Salgado LJ. Associated anomalies in individuals with polydactyly. Am J Med Genet. 1998 Dec 28;80(5):459-65.