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Injury to the internal carotid artery (ICA) is a potentially catastrophic complication of C1-lateral mass (C1-LM) or C1–C2 transarticular screw insertion.This study was designed to determine the risk of injury to the ICA during placement of these screws using computed tomography angiography (CTA).Radiographic analysis using CTA.One hundred sixty CTAs were examined, for a total of 320 ICAs.Not applicable...