CT appearance of the retroaortic anastomoses of the azygos system

AJR. American Journal of Roentgenology
J E Takasugi, J D Godwin

Abstract

The terminations of the hemiazygos and accessory hemiazygos veins can be mistaken for normal or enlarged posterior mediastinal lymph nodes on CT scans of the chest. These terminations are termed the retroaortic anastomoses by anatomists. We studied the CT appearances of these veins on scans of one cadaver and seven patients. We found that the retroaortic anastomoses usually were clearly recognizable because of their continuity with the hemiazygos or accessory hemiazygos vein. However, it is sometimes possible to mistake these vessels for lymph nodes, especially when only short segments of the vessel are visible on a CT image or when the vessel is not clearly opacified by contrast material. Familiarity with the CT appearances of the hemiazygos and azygous veins can prevent their being mistaken for normal or enlarged lymph nodes.

Citations

Jun 17, 1999·Surgical and Radiologic Anatomy : SRA·A OzbekH Dalçik
Jan 1, 1996·Surgical and Radiologic Anatomy : SRA·H H CelikM Cumhur
Mar 22, 2001·Radiographics : a Review Publication of the Radiological Society of North America, Inc·K H DoJ H Park
Jun 10, 2010·Clinical Anatomy : Official Journal of the American Association of Clinical Anatomists & the British Association of Clinical Anatomists·H MiyakeY Fujikura
Jul 11, 2013·Case Reports in Vascular Medicine·Suat KeskinNevin Sekmenli
Apr 5, 2008·Heart and Vessels·Tamaki IchikawaYutaka Imai
Oct 5, 2020·Surgical and Radiologic Anatomy : SRA·Konstantinos KoutsouflianiotisKonstantinos Natsis

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