Periodic alternating nystagmus.
D000368:Aged; D001488:Basilar Artery; D005133:Eye Movements; D006801:Humans; D002546:Ischemic Attack, Transient / Q000150:complications; D008297:Male; D009759:Nystagmus, Pathologic / Q000175:diagnosis* / Q000209:etiology; D014652:Vascular Diseases / Q000150:complications; D014724:Vestibular Function Tests