神經科LU, CHIEN-JUNGCHIEN-JUNGLUHWANG, BAO-SHOWBAO-SHOWHWANGLIN, WIN -HWANWIN -HWANLINYIP, PING-KEUNGPING-KEUNGYIP2009-01-192018-07-122009-01-192018-07-122000http://ntur.lib.ntu.edu.tw//handle/246246/99652The purpose of this report is to discuss the value of ultrasonographic examination in the diagnosis and follow-up evaluation of vertebral artery dissection. We collected data on 8 patients with 11 pathologic vessels: 9 were affected intracranially and 6 were affected extracranially. Four vessels were affected in both intracranial and extracranial segments. Extracranial color-flow duplex sonography could detect abnormalities in every extracranial vertebral artery dissection. Most abnormal findings were nonspecific, including severely reduced flow, absence of flow, and absence of diastolic flow. A specific finding (intramural hematoma) was noted in one artery. Abnormal transcranial color-coded sonographic findings included absence of flow, reduced velocity and reversed flow direction. Three intracranial dissecting arteries showed normal findings on transcranial color-coded sonography. Ultrasonographic follow -up study revealed evidence of improvement; this was noted almost exclusively in the extracranial segments of the vertebral artery but infrequently in the intracranial segment. Extracranial color-flow duplex sonography is sensitive in the detection of extracranial vertebral artery dissection, both in initial diagnosis and in follow-up evaluation.en-USdissectionvertebral arteryextracranial color-flow duplex sonographytranscranial color-coded sonographyMR- ANGIOGRAPHYULTRASOUND