In the presence of a ductal-dependent lesion such as critical coarctation of the aorta, interrupted aortic arch and isolated subclavian artery, the flow goes from the pulmonary artery to the aorta ...

The first branch is the right carotid and does not classify as a RAA branching pattern; one may be fooled into believing this is a left aortic arch with the first branch coursing rightward (see ...