title: Clinical Characteristics of Posterior and Lateral Semicircular Canal Dehiscence.
abstract: The objective of this study was to evaluate the characteristic symptoms of and treatments for lateral semicircular canal dehiscence (LSCD) and posterior semicircular canal dehiscence (PSCD) and its proposed mechanism. A dehiscence acquired in any of the semicircular canals may evoke various auditory symptoms (autophony and inner ear conductive hearing loss) or vestibular symptoms (vertigo, the Tullio phenomenon, and Hennebert sign) by creating a "third mobile window" in the bone that enables aberrant communication between the inner ear and nearby structures. A PubMed search was performed using the keywords lateral, posterior, and semicircular canal dehiscence to identify all relevant cases. Our data suggest that PSCD, although clinically rare, is most likely associated with a high-riding jugular bulb and fibrous dysplasia. Patients may experience auditory manifestations that range from mild conductive to extensive sensorineural hearing loss. LSCD is usually associated with chronic otitis media with cholesteatoma.
authors.affiliation: Department of Neurosurgery, University of California, Los Angeles, Los Angeles, California, United States.
authors.forename: Marko
authors.initials: M
authors.lastname: Spasic
authors.affiliation: Department of Neurosurgery, University of California, Los Angeles, Los Angeles, California, United States.
authors.forename: Andy
authors.initials: A
authors.lastname: Trang
authors.affiliation: Department of Neurosurgery, University of California, Los Angeles, Los Angeles, California, United States.
authors.forename: Lawrance K
authors.initials: LK
authors.lastname: Chung
authors.affiliation: Department of Neurosurgery, University of California, Los Angeles, Los Angeles, California, United States.
authors.forename: Nolan
authors.initials: N
authors.lastname: Ung
authors.affiliation: Department of Neurosurgery, University of California, Los Angeles, Los Angeles, California, United States.
authors.forename: Kimberly
authors.initials: K
authors.lastname: Thill
authors.affiliation: Department of Neurosurgery, University of California, Los Angeles, Los Angeles, California, United States.
authors.forename: Golmah
authors.initials: G
authors.lastname: Zarinkhou
authors.affiliation: Division of Otolaryngology Head and Neck Surgery, University of California, Los Angeles, Los Angeles, California, United States.
authors.forename: Quinton S
authors.initials: QS
authors.lastname: Gopen
authors.affiliation: Department of Neurosurgery, University of California, Los Angeles, Los Angeles, California, United States ; UCLA Jonsson Comprehensive Cancer Center, University of California, Los Angeles, Los Angeles, California, United States.
authors.forename: Isaac
authors.initials: I
authors.lastname: Yang
keywords: autophony; lateral semicircular canal dehiscence syndrome; posterior semicircular canal dehiscence syndrome; superior semicircular canal dehiscence syndrome; vertigo