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Interobserver agreement was good except for the presence of annular contrast enhancement.In the stenotic dissection group(n=12),the presence of a narrowed eccentric lumen at the upper portion of the ICA on axial CT images was classified correctly in all cases(sensitivity,100%;specificity, 100%).An arterial wall thickening was seen in all cases of dissection but also in three cases of the control group.In the occlusive dissection group (n=6),the enlargement of the dissected artery was the best criterion (sensitivity,100%,specificity,100%)for occlusive dissection.Helical CT seems to be a reliable method for evaluating extracranial ICA dissection. The analysis of the residual arterial lumen and the measurement of the external diameter of the carotid artery were the best criteria for the diagnosis.Further studies with larger groups are required to determine whether ICA dissections might be diagnosed using helical CT as a first procedure. |
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arterial dissection
arterial dissection,carotid
CAT scan
CAT scan,abnormal
CAT scan,helical
interobserver agreement
MRI,CAT scan compared to
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