MR angiography of aberrant left subclavian artery arising from right-sided thoracic aortic arch

Right-sided thoracic aortic arch with aberrant left subclavian artery is an uncommon entity that is usually asymptomatic, but may present in adults with symptoms of dysphagia. Cross-sectional imaging such as CT or MR is often required to conclusively diagnose this condition, which may be suggested by chest radiograph or barium swallow. MRI including TRICKS (time-resolved imaging of contrast kinetics) magnetic resonance angiography (MRA) was utilized in the evaluation of a 40-year-old man presenting with dysphagia and abnormal barium swallow study. TRICKS MRA is a recently developed MRA technique, which can provide multiple high-resolution images of the thoracic vessels with a high temporal resolution without the need for timing doses of gadolinium contrast or multiple injections.