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Intramural hematoma and intraluminal thrombus. Axial (a) and sagittal (b) CT angiographic images at the C1 level demonstrate left V3 segment vertebral artery wall thickening and luminal narrowing (>25%) (black arrows), representing intramural hematoma, as well as a focal luminal thrombus (white arrow in b), compatible with grade II injury.
