Figure 1
From: Long-term outcome of vertebral artery origin stenosis in patients with acute ischemic stroke
Classification of vertebral artery origin stenosis. Representative cases of asymptomatic stenosis of vertebral artery origin (A) when acute infarcts were observed in the anterior circulation and symptomatic stenosis of vertebral artery origin (B) when acute infarcts were observed only in the posterior circulation. Arrowheads indicate stenosis of vertebral artery origin. (C) Patient inclusion flowchart.