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Aberrant right subclavian artery (ARSA) aneurysm can be an important cause of mortality or potential rupture of the esophagus or trachea. It is important to emphasize that diagnosis of ARSA aneurysm is crucial to avoid fatal complications. Contrast-enhanced computed tomography (CECT) is the best imaging modality to illustrate the necessary details of the anatomy and such complications. The aim of this report was to demonstrate the usefulness of CECT in 2 cases of ARSA aneurysm.