title: Tullio phenomenon in superior semicircular canal dehiscence syndrome.
abstract: Tullio phenomenon refers to eye movements induced by sound.(1) This unusual examination finding may be seen in superior semicircular canal dehiscence (SSCD) syndrome.(2) This disorder is due to absent bone over the superior semicircular canal (figure). Patients complain of dizziness triggered by loud sound, aural fullness, autophony, and pulsatile tinnitus. When Tullio phenomenon exists in SSCD syndrome, the patient develops a mixed vertical-torsional nystagmus in which the slow phase rotates up and away from the affected ear (video on the Neurology® Web site at Neurology.org). This pattern of nystagmus aligns in the plane of the dehiscent semicircular canal and is due to excitation of its afferent nerves.
authors.affiliation: From the Division of Otology-Neurotology, Department of Otolaryngology-Head and Neck Surgery, University of Michigan Health System, Ann Arbor, MI.
authors.forename: Gregory J
authors.initials: GJ
authors.lastname: Basura
authors.forename: Scott J
authors.initials: SJ
authors.lastname: Cronin
authors.forename: Katherine D
authors.initials: KD
authors.lastname: Heidenreich
mesh_terms: D006801:Humans; D009759:Nystagmus, Pathologic / Q000503:physiopathology*; D012665:Semicircular Canals / Q000503:physiopathology*; D013701:Temporal Bone / Q000503:physiopathology*; D014012:Tinnitus / Q000209:etiology* / Q000473:pathology