Preaxial Hallucal Polydactyly

Carey et al. (1990) reported a possible causal relationship between maternal diabetes and hallucal polydactyly, with a very unusual proximal placement of the extra digit. They suggested that this was a useful diagnostic marker of teratogenic effects in infants with multiple congenital abnormalities. Slee and Goldblatt (1997) reported a child with multiple skeletal abnormalities, including preaxial polydactyly, who was born to a woman with poorly controlled insulin-dependent diabetes. The proximal placement of the duplicated hallux was illustrated.