title: Voluntary nystagmus masquerading as Tullio's Phenomenon.
abstract: Nystagmoid eye movements elicited by humming loudly was initially misdiagnosed as Tullio's phenomenon (abnormal acoustical stimulation of the vestibular apparatus owing to labyrinthine fistula). Further workup lead to a final diagnosis of a form of voluntary nystagmus characterized in some reports as "hysterical mystagmus". Some of the characteristics of this example of voluntary nystagmus differed from generally accepted descriptions.
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D004244:Dizziness / Q000150:complications; D004585:Electrooculography; D005133:Eye Movements; D006311:Hearing Disorders / Q000175:diagnosis*; D006801:Humans; D007046:Hysteria / Q000150:complications; D007759:Labyrinth Diseases / Q000175:diagnosis*; D008297:Male; D009759:Nystagmus, Pathologic / Q000175:diagnosis* / Q000209:etiology; D014831:Voice; D014836:Volition