Prenatal diagnosis of right aortic arch by fetal echocardiography.

*Corresponding author. E-mail address: [email protected] (F. Silva). Right aortic arch is a cardiovascular malformation or a variant of normality which can be diagnosed by prenatal ultrasound. This malformation may be associated with DiGeorge syndrome (arising from defects in chromosome 22) and can result in posterior compression of the trachea and esophagus, leading to dysphagia and respiratory impairment after birth. Figure A Right aortic arch passing posterior to the trachea. AO: aorta; PA: pulmonary artery; RV: right ventricle; SVC: superior vena cava; TR: trachea.