Prenatal Diagnosis of Down Syndrome Associated with Right Aortic Arch and Dilated Septum Cavi Pellucidi
Figure 1
(a) Color Doppler ultrasound (three vessels and trachea view) showing two parallel vessels. This was the first clue to the diagnosis of cardiac malformation and subsequent fetal aneuploidy. AO: aortic arch, P: pulmonary vein, D: ductus arteriosus. (b) Color Doppler ultrasound showing a vascular retroesophageal ring formed with the union of the right aortic arch and the prolongation of the ductus arteriosus. As the aortic arch passes over the right bronchus, the encounter between both circulations occurs behind the esophagus. AO: aortic arch, P: pulmonary vein, D: ductus arteriosus, VR: vascular ring, T: trachea, E: esophagus. In the union of the ductus arteriosus and the aortic arch a small outpouching is seen forming a small diverticulum of Kommerell (arrow), where the aberrant left subclavian artery (not seen in this picture) joined.
