Ultrasound Criteria for Assessment of Vertebral Artery Origins

BACKGROUND AND PURPOSE We sought to validate ultrasound as a reliable means of assessing vessel stenosis of vertebral artery origins. METHODS We reviewed 1,135 patient charts with ultrasound of the posterior circulation performed in 2008‐2015 in a single hospital. Inclusion criteria for native vessels consisted of ultrasound and digital subtraction angiography (DSA) performed within 3 months. Patients with indwelling stents were analyzed...