Traumatic intracranial aneurysms54,55 are relatively uncommon, with approximately 100 reported in the literature. Most occur in association with fractures of the base of the skull and involve the extracranial portion of the internal carotid artery. When the aneurysms occur intracranially, they most
commonly involve the anterior aspect of the circle of Willis. Traumatic aneu-rysms might be either true or false aneurysms. Those involving the cerebral arteries are true aneurysms, as they are formed due to the lack of an external elastic lamina in the cerebral vessels.
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