Abberant right subclavian artery aneurysm

Case contributed by Dr Lee-Anne Slater


Pre operative chest x-ray in a smoker.

Patient Data:

Age: 76
Gender: Male
Modality: X-ray

A well defined round to oval opacity in the right paratracheal region.

Modality: CT

The right subclavian artery is arising from the arch of aorta directly posterior to the esophagus. There is round aneurysmal dilatation of right subclavian artery near its origin. The aneurysm is abutting and compressing the lateral wall of esophagus and posterior wall of trachea.

Case Discussion:

Abberant right subclavian artery (ARSA) is the most common aortic arch anomaly and aneurysmal dilatation of proximal portion of aberrant right subclavian artery is common and referred to as Kommerell diverticulum which appears as bulbous enlargement of proximal subclavian artery at its origin from aortic arch, posterior to oesophagus.

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