Midtrimester sonographic diagnosis of mandibulofacial dysostosis.

Two fetuses at risk for mandibulofacial dysostosis (MFD) were monitored sonographically during the midtrimester of pregnancy. Normal facial and auricular structure were identified in one fetus, and a healthy infant was subsequently delivered. Severe microtia and micrognathia were apparent in the second fetus and a diagnosis of MFD was made and confirmed at delivery. These observations indicate that midtrimester sonographic diagnosis of severe MFD is possible.