Traumatic dissections of the carotid or vertebral arteries in the neck can cause stroke. This can be due to strangulation or whiplash mechanisms which may tear the intima. Typically the carotid is dissected usually just proximal to entering the petrous bone at about the C1-C2 level. Post-traumatic pseudoaneurysms can occur as a result of vascular injuries intracranially. These do not have to be located at more typical locations for nontraumatic aneurysms around the circle of Willis.
Vascular spasm can occur as a result of subarachnoid hemorrhage.
New York, McGraw Hill Book Company 1985, p.644. Fobben ES, Grossman RI, Atlas SW, et al. Current Concepts of imaging of craniofacial trauma. Neuroimag Clin North Am, Volume 1, Number 2, 1991. Chambers, EF, Rosenbaum AR, Norman D, etal.