Sonographic appearance of craniofacial dysostosis in utero.

Crouzon's syndrome, or craniofacial dysostosis, is a rare congenital abnormality which may be associated with life-threatening conditions, such as congenital heart defects. The effects of the premature synostosis and some of the facial abnormalities can be detected antenatally with ultrasound and thus provide the paediatrician with a useful 'early warning system'.