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Aberrant right subclavian artery

Case contributed by Dr Bruno Di Muzio


Examination for evaluation of carotid stenosis on previous doppler.

Patient Data:

Age: 81
Gender: Female
Race: Caucasian
Modality: CT

Case Discussion:

Instead of being the first branch (with the right common carotid as the brachiocephalic artery), aberrant right subclavian artery (ARSA) arises on its own as the fourth branch, after the left subclavian artery. It then hooks back to reach the right side. Its relationship to the oesophagus is variable:

•80 % posterior to oesophagus
•15 % between oesophagus and trachea
•5 % anterior to the trachea

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