PMC9168035_01
(A) Aortic arch catheter angiogram showing the right vertebral artery (VA) was tenuous and did not enter the skull; the left VA was absent. (B,C) Lateral internal carotid artery (ICA) catheter angiogram showed that bilateral posterior communication arteries were stunted (arrow) and collateral circulation was poor.
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F1
The lateral internal carotid artery (ICA) catheter angiogram showed that the bilateral posterior communication arteries were stunted, and that collateral circulation was poor (Figure 1).
(A) Lateral ICA catheter angiogram showing a large collateral vessel [type1 proatlantal intersegmental artery (PIA)] was found emanating from the carotid segment of the ICA (arrow). (B) Angiography via type1 PIA demonstrated the basilar artery (BA) occluded far from the anterior inferior cerebellar artery (arrow).
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F2
The BA was occluded far from the anterior inferior cerebellar artery (Figure 2).