Title:
Posterior semicircular canal dehiscence: value of VEMP and multidetector CT
Authors:
R. Vanspauwen*, L. Salembier*, L. Van den Hauwe**, P. Parizel**, F. L. Wuyts* and P. H. Van de Heyning*
Institutions:
*Antwerp University Research Center for Equilibrium and Aerospace (AUREA), University Department of Otorhinolaryngology, Head and Neck Surgery,Antwerp, University Hospital, University ofAntwerp,Antwerp, Belgium; **University Department of Radiology, Antwerp University Hospital, University ofAntwerp, Antwerp, Belgium
Keywords:
Posterior semicircular canal dehiscence; otosclerosis; vestibular evoked myogenic potential (VEMP); multi-detector computed tomography (MDCT) scan; Menière’s disease
Pages:
141 - 145
Abstract:
Posterior semicircular canal dehiscence: value of VEMP and multidetector CT. Objective : To illustrate that posterior semicircular canal dehiscence can present similarly to superior semicircular canal dehiscence. Case study: The symptomatology initially presented as probable Menière’s disease evolving into a mixed conductive hearing loss with a Carhart notch-type perceptive component suggestive of otosclerosis-type stapes fixation.A small hole stapedotomy resulted in a dead ear and a horizontal semicircular canal hypofunction. Recurrent incapacitating vertigo attacks developed. Vestibular evoked myogenic potential (VEMP) testing demonstrated intact vestibulocollic reflexes. Additional evaluation with high resolution multidetector computed tomography (MDCT) of the temporal bone showed a dehiscence of the left posterior semicircular canal. Conclusions: Besides superior semicircular canal dehiscence, posterior semicircular canal dehiscence has to be included in the differential diagnosis of atypical Menière’s disease and/or low tone conductive hearing loss. The value of perform- ing MDCT before otosclerosis-type surgery is stressed. VEMP might contribute to establishing the differential diagnosis.
Issue:
Vol. 2, 2006, 3rd trimester


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Posterior semicircular canal dehiscence: value of VEMP and multidetector CT