CTICasesSuperior vena cava diverticulum
Imaging findings
Chest CT with contrast demonstrates a large, blind-ending vascular pouch arising from the distal left brachiocephalic vein near the confluence with the superior vena cava, which fills with contrast and simulates an anterior mediastinal mass on chest radiographs.
Key takeaways
A superior vena cava or brachiocephalic vein diverticulum is an extremely rare vascular anomaly that can mimic an anterior mediastinal mass. It presents as a contrast-filled pouch communicating with the venous system and may fill slowly, showing delayed enhancement relative to other veins.
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