P32.02: The contribution of 3D reconstructions in pre- and postnatal assessment of a double aortic arch

was assigned male gender if the angle was > 30◦, and female gender if the genital tubercle was parallel or convergent (< 10◦) to the horizontal line. The intermediate angle (10–30◦) meant gender not determined. Fetal sex was confirmed at the 22 weeks sonogram. Results: Fetal gender assessment was possible in 88.5% of cases, with accuracy rates of 90%, above 12 weeks. The accuracy of male gender assignment was 95–100% at all gestational ages, and that of female gender assignment between 56.4% (at 11 − 11 + 6 weeks) and 98% (at 13 − 13 + 6 weeks). Conclusion: Prenatal gender assignment by early ultrasound is possible and has a high accuracy, particularly above 12 weeks of gestation.