Prenatal ultrasound diagnosis of fetal right aortic arch

LIUYa-qin; LUAN Ze-dong; YU Xiao-bo; ZHANG Xiao-ping; WANG Xiao-yan; ZOUYan-li

Abstract：Objective To improve prenatal detection rate of fetal right aortic arch by reviewing prenatal features .Meth-ods A total of 9 feuses with right aortic arch were retrospectively reviewed .Their prenatal sonogram features were ana-lyzed also .Results The 9 cases had fetal right arch ,including 4 cases with isolated right aortic arch ,two cases with double aortic arch ,one case with polycystic kidney ,one case with pulmonary atresia of ventricular septal defect ,one case with pulmonary atresia of ventricular septal defect ,double outlet of right ventricle and persistent left superior vena cava . Aortic arch of the 9 cases was located on the right of trachea by three-vessel trachea view ,the angle between aortic arch and aortic ascendens was increased by left ventricular outflow tract view of non-standard .Five cases were right aortic arch with aberrant left subclavian artery and left ductus arteriosus formed U-shaped vascular rings .Two cases of double aortic arch formed O-shaped vascular rings .The other two cases with brachiocephalic artery mirror branch and ductus arteriosus that connected to aberrant left subclavian artery were not formed vascular rings .Four cases were proved by anatomic and five cases were proved by neonatal echocardiography in 9 cases .Conclusion Fetal right aortic arch has ultasonographic features based on these features ,it is possible to diagnose fetal right aortic arch .The three-vessel trach view and left ven-tricular outflow tract view of non-standard are import view for prenatal screening and diagnosis of right aortic arch .