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Thirteen patients exhibited spontaneous dissection.Of these,8 of 13(62%) patients and 13 of 20(65%)internal carotid arteries,viewed to the siphone, had significant redundancies,kinks,coils,or loops.Of 108 consecutive arteriograms of patients without dissection,in which 187 internal carotid arteries were viewed to the siphon,there were 20(19%)patients and 22(12%) of 187 vessels with significant redundancy.Five patients in the dissection group and 2 in the nondissection group had bilateral internal carotid artery redundancy(P=.0019 and P=.0001,respectively).We found a significant correlation between internal carotid artery redundancy and dissection, particularly if redundancy is present bilaterally. |
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