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目的:验证有症状的重度颅内血管粥样硬化性狭窄患者是否比中度狭窄患者在接受选择性球囊支架血管成形术后发生卒中的危险性更
PURPOSE: To verify whether patients with symptomatic severe intracranial atherosclerotic stenosis have a greater risk of developing a stroke than patients with moderate stenosis after selective balloon stenting