 There is a common origin of the left common carotid artery and the brachiocephalic trunk. The vertebral arteries arise normally from the subclavian arteries. There is multifocal irregularity involving the right vertebral artery, which is nondominant, particularly in its lower cervical segment and the V4 segment. There is a focus of high-grade focal stenosis approximately 3 cm from the origin of the right vertebral artery. At least moderate multifocal stenosis affects the right V4 segment. Left vertebral artery, which is dominant, demonstrates no significant stenosis. The basilar artery demonstrates mild irregularity without significant stenosis. The bilateral common and internal carotid arteries also demonstrate no significant stenosis. No findings to suggest arterial dissection.
Multifocal stenoses affecting the right vertebral artery in the neck and intracranially. The left vertebral artery, which is dominant, and the bilateral carotid arteries remain patent.