Could be, but: It is likely that atherosclerosis would be present both in anterior and posterior circulations to some extent, but there could be more obstruction in vertebral-basilar system than in carotid areas. The syndome called "tip of the basilar" is such an isolated issue. A fully blocked basilar artery could be a seriously malignant stroke and could contribute to rapid demise.
Answered 11/5/2012
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