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A: Noncontrast-enhanced CT scan demonstrating diffuse SAH, temporal horn dilation, and the aneurysm's location anterior to the upper pons. B: Computed tomographic angiogram demonstrating absent opacification of the right ICA and narrowed filling of the left ICA vessel (black arrow). C: Lateral projection vertebral angiogram demonstrating the basilar apex aneurysm. The posterior circulation supplies the PCoA vessels (black arrow) to provide collateral flow to the anterior and middle cerebral territories. D: Lateral projection of left and right common carotid angiograms. Bilateral ICA dissections and severe stenoses are noted, with external carotid artery collateralization via ethmoidal and middle meningeal vessels (asterisks).
Baumgartner RWArnold MBaumgartner IMosso MGönner FStuder A: Carotid dissection with and without ischemic events: local symptoms and cerebral artery findings. Neurology 57:827–8322001
Biffl WLRay CE JrMoore EEFranciose RJAly SHeyrosa MG: Treatment-related outcomes from blunt cerebrovascular injuries: importance of routine follow-up arteriography. Ann Surg 235:699–7072002
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