There was an increasing trend in the prevalence of BA involvement from the no-recurrence group to the single-recurrence and multiple-recurrences groups (41.4%, 54.3%, and 64.0%, respectively), and also in poor primary collaterals (33.6%, 65.7%, and 76.0%, respectively).
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Collateral Flow in Magnetic Resonance Angiography: Prognostic Value for Vertebrobasilar Stenosis With Stroke Recurrence.
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