Right-sided aortic arch with aberrant left subclavian artery diagnosed in an infant with regurgitation

Right-sided aortic arch with aberrant left subclavian artery is a rare congenital anomaly of the aorta that occurs in less than 0.1% of the population. Patients are asymptomatic in most cases, and the anomaly is found incidentally; however, symptoms can occur due to the compression of other structures, mostly the trachea and esophagus. In this report, we present a case of esophageal compression by a right-sided aortic arch with aberrant left subclavian artery that mimicked gastro-esophageal reflux in a 3-month-old (87-day-old) infant with complaint of regurgitation, vomiting, and failure to gain weight who was diagnosed through a barium meal study.