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Left Vertebral Artery Origin from the Thyrocervical Trunk: A Unique Vascular Variant

W.M. Struba, J.L. Leacha,b and T.A. Tomsicka,b

a Department of Radiology, University of Cincinnati, Cincinnati, Ohio
b Division of Neuroradiology, University of Cincinnati, Cincinnati, Ohio


Figure 1
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  		Fig 1. A, Oblique, volume-rendered CT angiogram projection. Note the left vertebral artery arising directly from the thyrocervical trunk and extending cephalad outside of the transverse foramina of the vertebral bodies (arrows). The suprascapular artery is noted arising directly from this vessel in the lower neck (arrowhead).

B, Posterior, volume-rendered CT angiogram projection. There has been a decompressive occipital craniectomy, and resection of the posterior arch of C1. The left vertebral artery is well seen continuing intracranially (arrows).


Figure 2
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  		Fig 2. A, Axial image of the cervical spine at C4 in bone algorithm. Note the absence of the foramen transversarium on the left (arrow).

B, Axial image of the cervical spine at C4 in soft tissue algorithm showing the course of the left vertebral artery (arrow).





Copyright © 2009 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X