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Prenatal Diagnosis of Antley-Bixler Syndrome and POR Deficiency

Elena Oldani, Catherine Garel, Martine Bucourt, Lionel Carbillon

(Department of Obstetrics & Gynecology, Hôpital Jean Verdier, Assistance Publique-Hôpitaux de Paris, Bondy, France)

Am J Case Rep 2015; 16:882-885

DOI: 10.12659/AJCR.895526

BACKGROUND: Prenatal diagnosis of severe bone diseases is challenging and requires complete and precise analysis of fetal anomalies to guide genetic investigation and parental counselling.
CASE REPORT: We report a rare case of Antley-Bixler syndrome prenatally diagnosed at 26 weeks’ gestation by ultrasound and computed tomography in a 28-year-old woman with a history of early termination of pregnancy for “malposition of the inferior limbs”. The prenatal ultrasound scan showed severe femoral bowing and frontal bossing. Taking into account the high probability of a recurrent severe skeletal disorder, a computed tomography (CT) scan was proposed. CT findings revealed bilateral femora deformation, craniosynostosis, severe midface hypoplasia, and radiohumeral synostosis. These anomalies strongly suggested Antley-Bixler syndrome. Sequencing of the POR gene in the fetus and the parents revealed compound heterozygous mutations in exon 9 and intron 7, both inherited from each parent, and this finding allowed genetic counseling.
CONCLUSIONS: The first step in the proper prenatal diagnosis of fetal bone disorders is the precise analysis of ultrasonographic images. However, when a severe fetal inherited disorder is strongly suspected in late mid-trimester, CT may be discussed and usefully contribute to diagnosis and prognosis assessment.

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