Microcephaly, holoprosencephaly, hypokinesia--second report of a new syndrome.

Two still-born males whose mothers were sisters are presented. The features holoprosencephaly, hypokinesia, microcephaly, talipes, and other contractures correspond to those in the two male sibs reported by Morse et al. (1987). We suggest that our cases now provide evidence of an X-linked rather than an autosomal recessive new syndrome.