There is a fracture at the level of C2 involving the right transverse process and the base of the odontoid process.
There appears to be a subtle linear filling defect within the horizontal portion of the right vertebral artery at the level of C2 concerning for a dissection flap.
The left vertebral artery is tortuous but otherwise normal. The internal and external carotid arteries are opacify normally. No significant stenosisis seen. The arteries comprising the circle of Willis are incomplete; the left ICA supplies both ACAs and the left MCA, the right ICA supplies the right MCA.
Suspected tiny dissection flap within right vertebral artery at site of C2 transverse fracture.