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Assessment of carotid artery patency on routine spin-echo MR imaging of the brain
Ist Teil von
American journal of neuroradiology : AJNR, 1991-09, Vol.12 (5), p.819-26; discussion 827-8
Ort / Verlag
United States: Am Soc Neuroradiology
Erscheinungsjahr
1991
Link zum Volltext
Quelle
MEDLINE
Beschreibungen/Notizen
We retrospectively reviewed the routine spin-echo MR studies of the brain in 12 patients with 13 angiographically demonstrated occlusions and in 14 patients with 16 high-grade stenoses of the carotid arteries. Intraluminal signal that was isointense with adjacent brain on long TR/short TE and long TR/long TE images was 100% specific for atherosclerotic occlusion. Of the 13 proved occlusions, six (46%) had significant degrees of hyperintense intraluminal signal indistinguishable from that observed consequent to slow flow distal to high-grade stenoses. MR detected only five (31%) of the 16 proved high-grade stenoses. Normal flow void does not exclude significant extracranial carotid stenosis. Occlusion cannot always be distinguished from high-grade stenosis when hyperintense intraluminal signal is encountered. However, a reliable diagnosis of atherosclerotic occlusion can be made when isointense intraluminal signal is observed.