Trisomy 18 (Edwards syndrome): report of two cases.

Edwards syndrome is the second most common autosomal trisomy syndrome, resulting from an extra chromosome in chromosome 18. Recently we encountered two cases with the following representative features: intrauterine growth retardation, polyhydramnios, low-set ears, micrognathia and clenched hands. Both cases were female newborns and had an abnormal karyotype 47, XX, 18.