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Identification of vertebral arteries on CT of the chest

E Oh, MD, D J Quint, MD and B H Gross, MD

Department of Radiology, University of Michigan Medical Center, Ann Arbor, MI 48109, USA



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  		Figure 1. Normal vertebral arteries. The vertebral arteries (arrows, b–d) are well-seen bilaterally arising from the posteromedial aspects of the subclavian arteries (arrowheads, a). a–d are serial sections extending cephalad from the level of the subclavian arteries. a, subclavian arteries; t, trachea; e, oesophagus.

 


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  		Figure 2. Non-visualization of vertebral arteries. Extensive collateral veins (arrowheads) due to superior mediastinal obstruction obscure the expected location of the vertebral arteries. Arrow, expected location of the left vertebral artery; t, trachea; e, oesophagus.

 


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  		Figure 3. Sympathetic block via a percutaneous approach. Contrast medium (arrow) injected along with the anaesthetic agent extends to the expected location of the left vertebral artery. t, trachea; e,oesophagus.

 




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