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We observed intramural hematoma in four patients on the first magnetic resonance scan and in all five patients during the course of the study.The shapes of the intramural hematomas were curvilinear,crescentic,"bamboo- cut,""band-like,"and spotty.The intensity of the intramural hematoma varied according to its age.On the T1-weighted and the proton images,the intramural hematomas appeared isointense to slightly hyperintense in the first few days and became hyperintense thereafter.The intramural hematomas became isointense or unrecognizable 2 months after onset.The T1-weighted image and the proton images were superior to the T2-weighted image in demonstrating the intramural hematomas.Magnetic resonance imaging is a sensitive tool for diagnosing intracranial vertebrobasilar artery dissection,particularly in the subacute to early chronic stage.Magnetic resonance imaging is complementary to angiography in that it can directly visualize intramural hematomas. |
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aneurysm,vertebral basilar system
arterial dissection
arterial dissection,basilar
arterial dissection,intracranial
arterial dissection,vertebral
basilar artery
MRI
MRI,abnormal
vertebral artery
vertebral-basilar artery,intraluminal clot
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