Risk factors for occlusive lesions of intracranial arteries in stroke‐free Japanese

425 stroke-free Japanese patients (245 men, 180 women), mean age 64.0 +/- 10.0 years, without a history of stroke or transient ischemic attack and without any abnormality on a neurological examination, who visited a neurology clinic requesting medical evaluation for possible cerebrovascular diseases.

Presence of significant occlusive lesions (>25% stenosis) in the extracranial internal carotid artery (ICA) and intracranial arteries (intracranial ICA, middle cerebral artery stem, intracranial vertebral artery, and basilar artery) evaluated by magnetic resonance angiography (MRA).surrogate