Mild de Lange syndrome--does it exist?

Abstract

A pair of mildly retarded, microcephalic twins (probably identical) are reported. They were initially diagnosed as having the de Lange syndrome on the basis of the synophrys, but, on follow-up, their main intellectual defect was in the area of expressive speech. It is suggested that the evidence in the literature for the existence of so-called mild de Lange is sparse and that the twins in this report might well have a different, possibly unique condition.