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Indexed/Abstracted in: EMBASE, Scopus
Online ISSN 1827-188X
Department of Sperimental Medicine and Pathology “La Sapienza” University, Rome, Italy
Aim. Prospective study of a case series in a tertiary care referral center. In certain pathologic states, sound or pressure transmitted to the inner ear may inappropriately activate the vestibular system. The Tullio phenomenon is historically associated with various disease but from 1998 also with the development of a third “mobile” window within the bony labyrinth, which permits transmission of vibration into vestibular apparatus, producing the sensation of vertigo. The new clinical entity is named: “Superior Canal Dehiscence of the Roof of the Superior Semicircular Canal”(SCDS).
Methods. Fiftyfive patients with vertigo, oscillopsia, and/or disequilibrium related to sound, changes in middle ear pressure, and/or changes in intracranial pressure were identified in a 3-year period. All of these patients had vertical-torsional eye movements induced by sound, pressure and/or vibratory stimuli.
Results. Twenty-eight of these patients had only low-frequency conductive hearing loss, normal middle ear function, intact acoustic reflexes. All patients had intact vestibular-evoked myogenic potentials. A high-resolution CT scan of the temporal bones in these patient revealed dehiscence of the superior semicircular canal.
Conclusion. The new clinical entity superior canal dehiscence syndrome is diagnosed by clinical symptoms and signs. Coronal computed tomography (CT) has been used to confirm the diagnosis.