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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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