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We herein report the case of an idiopathic aneurysm of the accessory hemiazygos vein diagnosed by contrast-enhanced computed tomography (CT) and angiography. The patient was asymptomatic, and a posterior mediastinal mass was incidentally found on CT. Because endoscopic ultrasonography showed no thrombus formation in the aneurysm, the patient was therefore managed conservatively.

Idiopathic Accessory Hemiazygos Vein Aneurysm with an Incidental Mediastinal Mass