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Of the 32 Vas, a segment of the artery was not assessable on contrast-enhanced MR angiography in each of four small Vas. A central signal void artifact of cervical arteries was seen in one patient and motion artifacts were seen in two, b ut images could be interpreted. A venous enhancement was detected in 10 of 16 examinations, but this did not prevent image analysis. Ten of 11 stenotic dissections returned to normal, whereas one stenotic dissection progressed to occlusion. Two pseudoa neurysms detected by initial angiography resolved spontaneously; one was revealed only by delayed MR angiography, and one was detected on an early MR angiogram and proved resolved on a late MR angiogram. Of the seven initially occluded Vas, five reopened , with a hairline residual lumen in each of three. This preliminary experience showed that contrast-enhanced MR angiography is a promising tool for imaging Vas; it allows the assessment of VA dissection changes over time. Most lesions tended to heal spo ntaneously, but persisting occlusion or pseudoaneurysm could be detected during the late course. |
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arterial dissection
arterial dissection,vertebral
cerebrovascular disease,noninvasive evaluation of
MRI
MRI,abnormal
MRI,angiography
MRI,angiography,contrast enhanced
MRI,serial
pseudoaneurysm
vertebral artery
vertebral artery occlusion
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