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There is dissection of the internal carotid artery below the skull base with a large medially projecting pseudoaneurysm measuring up to 1.2 cm in maximum dimension. The mural haematoma extends into the carotid canal but not convincingly into the cavernous sinus. The is no definite intradural extension and no luminal irregularity in the intracranial vessels to suggest intradural extension. The intracranial vessels opacity normally.
The left common and internal carotid arteries opacify normally. The vertebral arteries are codominant. Aortic arch anatomy is conventional. Cervical spine alignment normal. No suspicious bone lesions.