Chest radiograph showing a<unk> , lateral view During pregnancy, prenatal ultrasound may reveal the abnormal course of the arch and this is the most common reason for identification of a<unk>  nowadays. Sometimes, when a<unk>  is seen before birth, it can actually be a double aortic arch, sometimes a fetal MRI scan may be helpful if the ultrasound is not clear. After birth, a<unk>  is visualized on chest radiography, by the aortic knob (the prominent shadow of the aortic arch) that is located<unk>  from the sternum instead of left. Complex lesions are often assessed by MRI or CT. Classification Several types of<unk>  exist, the most common ones being<unk>  with aberrant left subclavian artery and the mirror-image type. The variant with aberrant left subclavian artery is associated with congenital heart disease in only a small minority of affected people. The mirror-image type of<unk>  aortic arch is very strongly associated with congenital heart disease, in most cases tetralogy of Fallot.
Right-sided aortic arch
Interrupted aortic arch
Double aortic arch
Situs ambiguus
Tracheal agenesis
Persistent left superior vena cava
Double inlet left ventricle
Iniencephaly