Aberrant right subclavian artery with background Takayasu arteritis

Case contributed by Ashok Kumar

Presentation

Bilateral upper limb claudication.

Patient Data

Age: 40 years
Gender: Female

MR angiogram with gadolinium demonstrates an aberrant right subclavian artery (arrowed). Note normal loss of signal (flow void) due to blood changing direction within the descending aorta. Also, note the associated aneurysmal dilatation of this vessel.

Coronal MR angiogram further demonstrates the aberrant origin of the right subclavian artery. Incidental gallstone noted (arrowed).

3D rendered image demonstrates the aberrant subclavian anatomy. In addition, there is considerable pruning and stenoses with areas of occlusion involving the subclavian arteries more distally (arrowed).

Case Discussion

Instead of being the first branch, the right subclavian artery arises on its own as the fourth branch, after the left subclavian artery. It then hooks back posterior to esophagus to reach the right side.

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