Bilateral obstruction of the vertebral arteries.
D000368:Aged; D001344:Autopsy; D003097:Collateral Circulation; D004569:Electroencephalography; D005260:Female; D006801:Humans; D002542:Intracranial Embolism and Thrombosis / Q000000981:diagnostic imaging / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D011859:Radiography; D014711:Vertebral Artery / Q000000981:diagnostic imaging / Q000473:pathology*