Extra digits may be present as an isolated finding, or they may occur as part of a syndrome, in which case other abnormalities are usually present. The most common form of polydactyly is an extra little finger.
Chad Haldeman-Englert, MD, Wake Forest University School of Medicine, Department of Pediatrics, Section on Medical Genetics, Winston-Salem, NC. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.