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Case 61 - Azygos continuation of the IVC

Published online by Cambridge University Press:  07 October 2011

By
John Hildebrandt
Edited by
Thomas Hartman
Thomas Hartman
Affiliation:
Mayo Clinic, Rochester
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Summary

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.

Type
Chapter
Information
Pearls and Pitfalls in Thoracic Imaging
Variants and Other Difficult Diagnoses
 , pp. 162 - 163
Publisher: Cambridge University Press
Print publication year: 2011

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References

Ginaldi, SChuang, DPWallace, S.Absence of the hepatic segment of the inferior vena cava with azygos continuationJ Comput Assist Tomogr 1980 4 112CrossRefGoogle Scholar
Mehta, MTowers, M.Computed tomography appearance of idiopathic aneurysm of the azygos veinCan Assoc Radiol J 1996 47 288Google ScholarPubMed
Seebauer, LPräuer, HWGmeinwieser, JA mediastinal tumor simulated by a sacculated aneurysm of the azygos veinThorac Cardiovasc Surg 1989 37 112CrossRefGoogle ScholarPubMed

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