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pubmed-article:10473912pubmed:abstractTextThirty-four patients with acute hemispheric ischemic strokes underwent both CT angiography and contrast-enhanced transcranial color-coded duplexsonography (TCCD) to study the effectiveness of the combined noninvasive techniques for evaluation of the circle of Willis. In 3/34 patients, CT angiography and contrast-enhanced TCCD demonstrated middle cerebral artery (MCA) occlusion, in 5 others MCA stenosis. A severe posterior cerebral artery stenosis was missed by CT angiography. In 8 patients, contrast-enhanced TCCD failed because of poor bone windows. In these patients, CT angiography was normal. CT angiography and contrast-enhanced TCCD are complementary noninvasive diagnostic tools. Disagreements between the diagnostic findings of these methods still need further evaluation by digital subtraction angiography.lld:pubmed
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pubmed-article:10473912pubmed:dateRevised2007-11-15lld:pubmed
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pubmed-article:10473912pubmed:articleTitleNoninvasive assessment of the circle of Willis in cerebral ischemia: the potential of CT angiography and contrast-enhanced transcranial color-coded duplexsonography.lld:pubmed
pubmed-article:10473912pubmed:affiliationDepartment of Neurology, University of Dresden, Germany. gahn@rcs.urz.tu-dresden.delld:pubmed
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