Congenital subclavian steal syndrome with multiple cerebellar infarctions caused by an atypical circumflex retroesophageal right aortic arch with atretic aberrant left subclavian artery.

A right-sided aortic arch is a rare anomaly with an incidence of 0.1% worldwide and is usually associated with a mirror image of all supra-aortic branches or an aberrant left subclavian artery. The latter is often associated with a Kommerell diverticulum, although it can rarely be hypoplastic or atretic and lead to congenital subclavian steal. In most patients, the situation is well-tolerated. In this report, we present a case of subclavian steal syndrome with multiple cerebellar infarcts in a patient with an atypical right-sided aortic arch and an atretic aberrant left subclavian artery arising from a left-sided descending thoracic aorta.