Left subclavian artery arising from right subclavian artery

Case contributed by Dr Henry Knipe


SAH ?Vasospasm. CTA was performed.

Patient Data

Age: 80 years
Gender: Female

Variant aortic arch anatomy with the right subclavian, right common carotid and left subclavian arteries arising from a common trunk.

ETT and NGT in situ. 

Case Discussion

This is a rare variant of aortic arch anatomy with only two vessels arising from the arch - the brachiocephalic artery and immediately distally (left) to it, the left common carotid artery. The left subclavian artery arises from the right subclavian artery and passes between the oesophagus and the spine to assume its "normal" course and branching pattern.

This case is different from the typical "aberrant left subclavian artery" which is the left subclavian artery arising as the fourth branch from a right-sided aortic arch (analogous to the aberrant right subclavian artery arising from a left-sided arch).

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Case information

rID: 25930
Published: 16th Nov 2013
Last edited: 16th Jul 2018
System: Chest, Vascular
Inclusion in quiz mode: Excluded

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