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[Vertebral artery dissections: follow-up with magnetic resonance angiography and injection of gadolinium].
Revue Neurologique 2000 December
Vertebral artery dissection is a frequent cause of ischemic stroke in young adults but time course of VA dissections remains poorly documented. Angiography was considered as the gold standard for the diagnosis. Recently, non-invasive methods have been developed such as helical CT and magnetic resonance angiography. The purpose of the study was to assess the reliability of a gadolinium-enhanced fast three dimensional (3D) magnetic resonance (MR) angiographic sequence to image vertebral arteries and to assess the long-term follow-up of vertebral artery (VA) dissections. Sixteen consecutive patients with 18 angiographically documented VA dissections were followed-up by gadolinium-enhanced 3D MR angiography and cervical T1-weighted MR imaging at a median delay of 22 months. Ten patients had MR imaging scan at the acute stage as well and nine had early follow-up angiography at a median delay of 3 months. MR angiography was evaluated in a consensus manner including image quality, presence of residual stenosis, luminal irregularities and occlusion. All patients clinically improved. Ten of 11 stenotic dissections returned to normality whereas one stenotic dissection progressed to occlusion. Two pseudoaneurysms detected on the initial angiography resolved spontaneously, one appeared only on a delayed MR angiographic scan and one was detected on early MR angiograms and finally resolved on a late one. Of the seven initially occluded VAs, five reopened with a hairline residual lumen in three. Contrast MR angiography is an interesting tool to assess the late course of VA dissections. Most lesions resolved spontaneously but persisting occlusion or pseudoaneurysm may be found in long term follow-up.
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