Vasa Vasorum: Another Cause of the Carotid String Sign
Monty A. Martina and
Tom R. Marotta
,a
a From the Department of Neuroradiology, Vancouver General Hospital, 855 W 12th Ave, Vancouver, BC, Canada V5Z 1M9.

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FIG 1. Lateral left carotid angiograms in 60-year-old man with two prior CVAs.
A, Early phase shows multiple serpiginous vessels projected over expected course of ICA (arrows).
B, Later phase of A.
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FIG 2. Lateral right carotid angiograms in 64-year-old woman with one prior CVA.
A, Early phase shows internal carotid stump (curved arrow) and collateral vessel originating from below ICA takeoff (straight arrows).
B and C, Later phases show continuation of collateral vessel to opacify distal ICA.
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FIG 3. Lateral right carotid angiograms in 66-year-old man with multiple TIAs and one CVA.
A and B, Multiple serpiginous vessels project over expected course of ICA (arrows) with anterograde filling of the distal ICA.
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FIG 4. Frontal right carotid angiograms in 39-year-old man approximately 5 months after right carotid dissection with occlusion.
A and B, Short-segment serpiginous network of vessels bridge narrowed cervical ICA to petrous portion of ICA (arrows).
C, CT angiogram, transverse view, shows multiple small vessels (arrows) at perimeter of reduced-caliber thrombosed ICA.
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