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Fig. 14B. —Bidirectional flow in internal carotid artery of 78-year-old
woman with prior right carotid endarterectomy and recurrent amaurosis fugax.
Spectral Doppler sonography tracings from mid internal carotid artery show
retrograde flow in posterior portion of vessel. This finding suggests second
tandem stenosis distally, producing swirling current of blood in interposed
arterial segment.
