CTICasesAneurysm of an Aberrant Right Subclavian Artery
Imaging findings
Frontal chest radiograph shows a sharp-rimmed mass along the left superior mediastinal border that remains well-defined above the clavicle (the non-cervicothoracic sign). On the lateral view, the mass is located post-tracheally in Raeder's triangle. Chest CT reveals a highly dilated, aneurysmal aberrant right subclavian artery (arteria lusoria) with extensive atheromatous calcification and eccentric mural thrombus.
Key takeaways
Aberrant right subclavian arteries (arteria lusoria) are common vascular variants that typically course retroesophageally. Over time, particularly in elderly patients, turbulent flow can lead to aneurysm formation, calcification, and thrombus deposition. These aneurysms present as retrospace masses on lateral radiographs.
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