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Follow-up digital subtraction anterolateral projection angiograms obtained after clot injection.
Left, APA is occluded just distal to origin of superior thyroid artery (arrow).
Center, One hour later, clot has progressed proximally to occlude superior thyroid artery.
Right, Later follow-up image obtained 2 hr after clot insertion shows that STA has recanalized (arrow) but APA remains occluded at clot insertion site.
