Asymmetry of intracranial internal carotid artery on 3D TOF MR angiography: a sign of unilateral extracranial stenosis

European Radiology
O NaggaraC Oppenheim

Abstract

The purpose of this case-control study was to determine whether an asymmetry of size of the intracranial internal carotid artery (ICA) on 3D time-of-flight MR angiography (MRA) is predictive of a high-grade cervical ICA stenosis. Ninety-six stroke/TIA consecutive patients were recruited for the study, of whom 32 had unilateral high-grade ICA stenosis (>or=70% NASCET) and were included into the case group, and the remaining 64 did not have such high-grade stenosis and were included in the control group. On intracranial MRA, two observers, blinded to the characteristics of cervical ICA stenosis, independently searched for qualitative size asymmetry between ICAs and measured the cross-sectional surface of the intracranial ICAs. An intracranial size asymmetry was seen in 28 of the 32 high-grade stenoses by both readers, and in 10 (reader(1)) and 8 (reader(2)) of the 64 controls (sensitivity =88%, specificity =84-88%). In patients without agenesia of the A1 segment of the circle of Willis (n=70), sensitivity was >or=90% and specificity =96%. Surfaces ratios were significantly different (p<0.001) between cases and controls. However, using ROC curves analysis, the quantitative processing did not improve the detection when compared wit...Continue Reading

References

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Citations

Sep 8, 2009·Radiographics : a Review Publication of the Radiological Society of North America, Inc·Simin Bahrami, Catherine M Yim
Apr 3, 2012·Techniques in Vascular and Interventional Radiology·Michael C HurleySameer Ansari
Jan 30, 2015·Diagnostic and Interventional Imaging·W Ben HassenO Naggara
Oct 23, 2012·Diagnostic and Interventional Imaging·C OppenheimJ-F Meder
Mar 10, 2012·Stroke; a Journal of Cerebral Circulation·Audrey MorelCatherine Oppenheim
Nov 10, 2021·Journal of Neurology·Filiz OsmanodjaKersten Villringer

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