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The clinical and radiographic findings in 20 patients with nontraumatic spontaneous dissection of the carotid vessels are reported. In 18 patients, the dissection was limited to the internal carotid artery; the extent of dissection varied. The radiographic findings were pathognomonic. Dissection occurs within the media of the vessel along a plane not present in normal arteries. Fibromuscular dysplasia and hypertension may be predisposing factors in spontaneous dissection of the carotid artery.
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