Aberrant right subclavian artery
CTA requested for carotid stenosis evaluation previously spotted on Doppler study.
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The right subclavian artery is the fourth and last aortic arch's branch and hooks back to reach the right side, passing posterior to the oesophagus.
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. Aberrant right subclavian arteries relationship to the oesophagus is variable:
- 80 % posterior to oesophagus
- 15 % between oesophagus and trachea
- 5 % anterior to the trachea