CTICasesDilated Azygos Arch
Imaging findings
Chest radiograph reveals a well-circumscribed, rounded density in the mediastinum in the expected location of the azygos arch. CT confirms a significantly dilated azygos arch secondary to near-occlusion of the SVC, with prominent venous collaterals in the chest wall.
Key takeaways
A dilated azygos arch should prompt consideration of SVC obstruction or other venous collateral pathways. It serves as a classic anatomic landmark and a potential marker for underlying venous pathology.
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