1. Date of download: 6/25/2016 Copyright © 2016 American Medical Association. All rights reserved. From: Stroke or Transient Ischemic Attacks With Basilar Artery Stenosis or Occlusion: Clinical Patterns and Outcome Arch Neurol. 2002;59(4):567-573. doi:10.1001/archneur.59.4.567 Time-of-flight cerebral magnetic resonance angiography centered on the posterior fossa showing moderate stenosis of the mid portion of the basilary artery in an 87-year-old man with an acute paramedian bilateral pontine infarction manifested by left internuclear ophthalmoplegia, dysarthria, right hemiparesis, and cerebellar ataxia of the lower limbs (outcome: level III in the Lausanne Stroke Registry). Figure Legend:

2. Date of download: 6/25/2016 Copyright © 2016 American Medical Association. All rights reserved. From: Stroke or Transient Ischemic Attacks With Basilar Artery Stenosis or Occlusion: Clinical Patterns and Outcome Arch Neurol. 2002;59(4):567-573. doi:10.1001/archneur.59.4.567 Time-of-flight cerebral magnetic resonance angiography showing severe stenosis of the vertebrobasilar junction in a 65-year-old man. Due to the severity of the stenosis, the rapid turbulent flow generates a flow void in the proximal portion of the basilar artery characteristic of severe stenosis. More distally, the basilar artery appears normal. This vertebrobasilar junction stenosis is related to bilateral occipital infarcts characterized by left homonymous hemianopia and visual agnosia (outcome: level II in the Lausanne Stroke Registry). Figure Legend:

3. Date of download: 6/25/2016 Copyright © 2016 American Medical Association. All rights reserved. From: Stroke or Transient Ischemic Attacks With Basilar Artery Stenosis or Occlusion: Clinical Patterns and Outcome Arch Neurol. 2002;59(4):567-573. doi:10.1001/archneur.59.4.567 A, Time-of-flight cerebral magnetic resonance angiography (MRA) showing a very low flow signal in the basilar artery, suggesting the diagnosis of basilary artery subocclusion. B, Results of a follow-up MRA 6 months later revealed that the normal flow signal was restored in the vertebral and basilar arteries. This 55-year-old woman was admitted to the emergency department with a slight right hemiparesis and bilateral cerebellar ataxia due to a bilateral pontine infarction (left > right) (outcome: level II in the Lausanne Stroke Registry). Figure Legend:

4. Date of download: 6/25/2016 Copyright © 2016 American Medical Association. All rights reserved. From: Stroke or Transient Ischemic Attacks With Basilar Artery Stenosis or Occlusion: Clinical Patterns and Outcome Arch Neurol. 2002;59(4):567-573. doi:10.1001/archneur.59.4.567 Frontal (A) and lateral (B) views of time-of-flight cerebral magnetic resonance angiography with a flow signal limited to the distal segment of the basilar artery. The diagnosis of proximal basilary artery thrombosis was confirmed by conventional cerebral angiography (C) showing a slowly inverted flow in the distal portion of the basilar artery. This 45-year-old woman was admitted because of left hemiplegia, occulomotor disorders, dysphagia, and dysarthria due to an infarction involving the lower two thirds of the pons (outcome: level IV in the Lausanne Stroke Registry). Figure Legend: