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MR Angiographic Demonstration of Bilateral Duplication of the Extracranial Vertebral Artery: Unusual Course and Review of the Literature

C. Ionetea and M.F. Omojolaa

a From the Department of Neurology and Radiology, Creighton University Medical Center, Omaha, Neb


Figure 1
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  		Fig 1. Right oblique view of maximum intensity projection of 3D contrast-enhanced MRA of the neck, showing bilateral proximal duplication of the vertebral arteries. Vertical arrows point to the 2 origins of the left vertebral artery. Curved arrow points to the union of the 2 left vertebral artery components. Transverse arrows point to the 2 origins of the right vertebral artery. Arrowhead points to the union of the 2 right vertebral artery components.


Figure 2
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  		Fig 2. Transverse source image from the 2D TOF MRA of the neck at C7 vertebral level showing the vertebral arteries in the foramen transversarium (single vertical arrow points to the right vertebral artery; double vertical arrows point to the left vertebral artery). The duplicated limb on the right (curved arrow) is located intimately medial to the right common carotid artery, whereas the duplicated vessel on the left (transverse arrow) is located posteromedially to the left common carotid artery.


Figure 3
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  		Fig 3. Schematic representation of the embryology of the duplication of the bilateral vertebral arteries. Modified from Goddard et al.4





Copyright © 2008 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X