CTICasesContrast Retention behind Azygos Vein Valves
Cite this case
[...]. Contrast Retention behind Azygos Vein Valves. CTICases. Published September 16, 2021. https://cticases.com/c/8agy9
Imaging findings
Chest CT shows small dense foci of contrast layering and pooling behind the valves in the azygos vein arch. This occurs during high-rate contrast injections where contrast refluxes into the azygos system and gets trapped behind the valves.
Key takeaways
Pooling of contrast material behind the valves of the azygos arch is a benign vascular variant/pitfall seen on contrast-enhanced CT. It is more prominent when contrast refluxes due to high injection rates or in the setting of superior vena cava (SVC) obstruction.
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