Assessment Of The Relation Between The Cerebral Collateral Circulation And Cerebral Infarction In Patients With Carotid Artery Stenosis Or Occlusion

BackgroundCarotid atherosclerosis and stenosis that occur often at Initial phase of the internal carotid artery and the cerebral middle artery is a important risk of cerebral infarction. It vary very much whether the presence of the cerebral infarction, the extent of the infarction and the severity of symptoms, because of the cerebral collateral circulation. Some trails have demonstrated that the risk of stroke and TIA decrease with increasing degrees of the cerebral collateral circulation in patients with severe internal carotid artery stenosis.1 , the cerebral collateral circulation in patients with carotid artery stenosis or occlusionThe arterial anatomy of the collateral circulation includes extracranial sources of cerebral blood flow and intracranial routes of ancillary perfusion that are commonly divided into primary or secondary collateral pathways. Primary collaterals include the arterial segments of the circle of Willis, whereas the ophthalmic artery and...