Conclusion
The retroaortic left brachiocephalic vein is a rare congenital systemic
venous anomaly, usually associated with malformations involving the
outflow tracts. It is also strongly associated with aortic arch
anomalies, such as right aortic arch and cervical aortic arch, patent
arterial duct, coarctation of aorta, and distal aortic arch aneurysms.
Although it does not cause clinical symptoms, knowledge of its presence
is important when surgical interventions are required in patients with
congenitally malformed hearts, especially in the setting of tetralogy of
Fallot, a functionally univentricular heart, right aortic arch, and
other aortic arch anomalies.