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. 2021 May;42(5):927–929. doi: 10.3174/ajnr.A7076

Fig 1.

Fig 1.

A, Right-sided near-occlusion with full collapse. Coronary view of CTA. Beyond severe stenosis (white arrowhead), distal ICA is difficult to visualize and has a threadlike appearance (white arrows). The distal ICA is clearly smaller than both the contralateral ICA (black arrow) and ipsilateral external carotid artery (black arrowhead) but is similar to the ascending pharyngeal artery (black star). A thrombus just proximal to the skull base is suspected (white star). ICA flow was 6 mL/min on the right side and 267 mL/min on the left side. B, Left-sided near-occlusion without full collapse. Coronary view of CTA. After severe stenosis (white arrowhead), the distal ICA is small but normal-appearing (white arrow), smaller than the contralateral ICA (black arrow), and similar to the ipsilateral external carotid artery (black arrowhead). ICA flow was 37 mL/min on the left side and 259 mL/min on the right side.