A new case of interstitial deletion of chromosome 3q, del(3q)(q13.12q21.3), with agenesis of the corpus callosum.

We describe a boy with an interstitial deletion of the proximal portion of chromosome 3q. Prominent physical characteristics were a dysmorphic face with apparent hypertelorism, signs of prenatal lymphedema, foot contractures and agenesis of the corpus callosum. The finding of corpus callosum agenesis in a previously reported patient with an overlapping deletion suggests an additional locus for this malformation.