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Definition of high plaque. (A) Definition of high plaque by Hans et al. The ICA is divided into three zones, with high plaque defined as that located above Zone 2. (B) Various definition of high plaque. Yellow line is the mastoid-mandibular line. Red line is the intersection of the occipital artery and internal carotid artery. White line is the C1 transverse process-hyoid bone line. ICA: internal carotid artery.
