Right aortic arch with aberrant left subclavian artery

Case contributed by Dr Fateme Hosseinabadi


Chest pain and dyspnea with suspicion of pulmonary thromboembolism.

Patient Data

Age: 50 years
Gender: Female

CT pulmonary angiography


 Scout view shows right aortic knob and arch as well as slight tracheal shift to the left, with cardiomegaly.

Pulmonary CTA demonestrating that the descending aorta continues inferiorly on the right side of the vertebral column. The aberrant left subclavian artery is the last branch to arise from Kommerell diverticulum at the distal end of aortic arch. The findings are consistent with a right aortic arch with aberrant left subclavian artery. Pulmonary arteries diameter is increased consistent with pulmonary arterial hypertention, cardiomegaly and moderate pericardial effusion are noted too.

Case Discussion

Approximately 0.1% of population has right aortic arch, and about half of them have an aberrant left subclavian artery which may arise from aorta or diverticulum of Kummerell.

How to use cases

You can use Radiopaedia cases in a variety of ways to help you learn and teach.

Creating your own cases is easy.

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.