Invited commentary.
D001344:Autopsy; D002560:Cerebrovascular Circulation; D002941:Circle of Willis / Q000000981:diagnostic imaging*; D006801:Humans; D018810:Magnetic Resonance Angiography; D011859:Radiography; D013348:Subclavian Artery / Q000000981:diagnostic imaging* / Q000601:surgery*; D014711:Vertebral Artery / Q000000981:diagnostic imaging*