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The dominant lesion patterns seen on CT and MRI were multilocal chainlike lesions in 19 and confluent striated lesions in 8 cases located in the supraventricular and paraventricular deep white matter.In 8 patients subcortical lesions extended into the adjacent cortex.Angiography revealed that extracranial occlusive disease(n=24)or stenosis of the middle cerebral artery(n=6_was always accompanied by impairment of the circle Willis,in either anterior part(n=25)and/or the posterior part(n=16). Moreover,leptomeningeal pathways indicative of vascular hemispheric compromise were identified in 26 cases.In total,29 of 30 patients displayed a noncompetent circle of Willis.Low-flow infarcts show typical but not pathognomonic lesion patterns on CT and MRI.Definite diagnosis requires knowledge of the complex vascular compromise of the extracranial and/or intracranial arterial system.A noncompetent circle of Willis should be regarded as the additional predisposing condition in the hemispheric low-flow infarcts. |
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border zone hypoperfusion border zone infarct carotid angiogram carotid artery disease carotid artery occlusion,intracranial carotid artery stenosis CAT scan CAT scan,abnormal cerebral infarction,subcortical cerebral ischemia cerebrovascular accident cerebrovascular disease circle of Willis middle cerebral artery,occlusion of middle cerebral artery,stenosis of MRI MRI,abnormal prognosis transient ischemic attack watershed infarcts white matter disease white matter disease,unilateral
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