Asymptomatic stenosis of intracranial or extracranial artery

**Definition:** Stenosis of intracranial or extracranial artery that has not caused TIA or cerebral ischemic stroke.

**Long definition:** This section includes cerebrovascular disease/abnormalities/vascular or neuroimaging findings that has not caused acute cerebral symptoms. Such findings should not be regarded as simply incidental findings; asymptomatic stenosis or occlusion of the intracranial or extracranial arteries to the brain are associated with an increased risk of future cardiovascular events that may be prevented from risk factor management and in selected cases surgical or endovascular procedures (1) “Precerebral” have been changed to “extracranial” as the latter term is the one generally used in the literature. Arteries to the brain are divided into intracranial and extracranial. The carotid siphon is included in the “intracranial” part of the carotid artery as the major part of the carotid siphon is located distal to the dural passage of the artery.

**Inclusions:** - narrowing of basilar, carotid or vertebral arteries, not resulting in cerebral infarction

**Exclusions:** - Transient ischaemic attack - Cerebral ischaemic stroke