Prenatal diagnosis of mandibulofacial dysostosis

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Abstract
Four fetuses at risk of the autosomal dominant Treacher—Collins syndrome were examined by fetoscopy in the second trimester of pregnancy. Findings were normal in two cases and healthy babies were delivered after uneventful pregnancies. Mandibular hypoplasia and abnormalities of the palpebra and auricles were seen in the other two fetuses; one had an associated cleft palate. These pregnancies were terminated and the diagnoses confirmed by post‐mortem examination.