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Published online by Cambridge University Press: 07 October 2011
Imaging description
Azygos continuation of the inferior vena cava (IVC) causes dilatation of the azygos and hemiazygos vein. On CT, there is dilatation and tortuosity of the veins as well as infrahepatic interruption of the IVC (Figures 61.1 and 61.2). Recognition of the interruption of the infrahepatic IVC is important to make the correct diagnosis.
Importance
The dilated azygos vein on noncontrast CT can be mistaken for a large azygos lymph node or mass. However, recognition of dilatation of the azygos vein and hemiazygos vein with interruption of the infrahepatic IVC will allow the correct diagnosis.
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