Prenatal Diagnosis of Down Syndrome Associated with Right Aortic Arch and Dilated Septum Cavi Pellucidi
Figure 4
(a) Anterior view of the mediastinum. The pulmonary artery (P) and ductus arteriosus (D) are seen crossing over the left bronchus towards a right-sided descending aorta. An aberrant left subclavian artery (ALSA) is seen branching at the union between the ductus and the aorta. Both left and right carotid arteries (RCA/LCA) branch from the aortic arch (AO) anteriorly to the trachea in a V-shape set up. We could not confirm the presence of a diverticulum of Kommerel at the origin of the left subclavian artery. An aberrant azygos vein (AZ) is seen separating the upper lobe of the right lung forming an azygos lobe. RL: right lung, LL: left lung, T: trachea, E: esophagus. (b) Posterior view of the mediastinum. Aberrant left and right subclavian arteries (ALSA/ARSA) are seen branching from the vascular ring (VR) in the union between the ductus and the aorta. Both left and right carotid arteries (LCA/RCA) are seen coming from the anterior mediastinum after branching from the aortic arch. An aberrant azygos vein (AZ) is seen separating the upper lobe of the right lung forming an azygos lobe. RL: right lung, LL: left lung, E: esophagus, DA: descending aorta. (c) Posterior view of the mediastinum. The descending aorta has been moved upwards in order to see the vascular ring (VR) (arrow). The ductus arteriosus (D) is seen crossing over the left bronchus joining the descending aorta (DA). A right aortic arch (A) is seen surrounding the esophagus (E). An aberrant azygos vein (AZ) was seen separating the upper lobe of the right lung forming an azygos lobe (AZL). RL: right lung, LL: left lung, E: esophagus.
