Prenatal diagnosis of right aortic arch with mirror-image branching without associated anomalies.

A pregnant woman at 32 weeks of gestation was referred because of untypical visualization of a three-vessel tracheal view. Detailed ultrasound examination demonstrated an abnormal position of descending aorta, positioned at the right-front side of the spine at the level of four-chamber view. The descending aorta was connected with left pulmonary artery through ductus arteriosus, which configured a vascular ring. Right aortic arch with mirror-image branching without any associated anomaly was suspected prenatally. Amniocentesis showed no chromosomal abnormality. A male, 2440-g infant was delivered vaginally at 37 weeks and 4 days of gestation. Echocardiography confirmed no associated congenital heart defect. Three-dimensional reconstruction using 64-slice spiral computed tomography angiography at 2-months old confirmed the diagnosis of right aortic arch with mirror-image branching. The infant is now 1 year old and well developed without any symptoms.