The authors report a case of cervical aortic arch. Left-sided cervical aortic arch is a very rare congenital anomaly which may or not be associated with clinical symptoms. Diagnosis, suspected on chest X-ray or clinical examination, must be confirmed by angiographic studies. A 17-year-old girl presenting an extensive aneurysm of a left-sided cervical aortic arch was successfully operated with the use of partial extracorporal bypass removing the aneurysm and restoring aortic arch continuity. Histological examination revealed mediacystic necrosis.
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