title: ENG of the month: periodic alternating nystagmus.
mesh_terms: D001139:Arnold-Chiari Malformation / Q000150:complications; D004584:Electronystagmography; D006801:Humans; D008297:Male; D008875:Middle Aged; D009759:Nystagmus, Pathologic / Q000175:diagnosis* / Q000209:etiology; D010507:Periodicity