Gadolinium-Enhanced CT Angiography of the Circle of Willis and Neck
John W. Hensona,
Raul G. Nogueiraa,
Diego J. Covarrubiasa,
R. Gilberto Gonzaleza and
Michael H. Leva
a From the Division of Neuroradiology, Massachusetts General Hospital, and Harvard Medical School, Boston, MA
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FIG 1. Gadolinium-enhanced CTA images obtained in a 63-year-old man with sudden-onset, severe headache.
A, Axial 1.25-mm gadolinium-enhanced CTA image shows the right posterior communicating artery (arrow).
B-F, Reconstructed images show the middle and anterior cerebral arteries (B), anterior communicating artery region (C), left posterior communicating artery (D), vertebrobasilar junction and basilar artery (E), and right posterior inferior cerebellar artery origin (F).
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FIG 2. Gadolinium-enhanced CTA images of the cervical vessels obtained in a 52-year-old woman with severe carotid stenosis disclosed by MRA.
A, Axial image shows absence of contrast material in the left internal carotid artery (arrow) and stenosis of the right internal carotid artery.
B, Reconstructed image shows absence of contrast in the left internal carotid artery and smooth tapered narrowing of the proximal vessel.
C, Smooth tapered narrowing of the right internal carotid artery.
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FIG 3. Gadolinium-enhanced CTA images obtained in a 71-year-old man with acute-onset, expressive aphasia and history of "carotid plaque."
A, Reconstructed gadolinium-enhanced CTA image shows mild stenosis of the left carotid bifurcation with scattered atherosclerotic calcification and hypoattenuated plaque.
B, Reconstructed image of the left common carotid artery origin shows mild atherosclerotic calcification without any significant stenosis.
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AJNR - American Journal of Neuroradiology