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  • Title: Computed tomography-based workup of conductive hearing loss with normal middle ear: don't forget superior semicircular canal dehiscence.
    Author: Teszler CB, Daval M, Altabaa K, Williams MT, Ayache D.
    Journal: Int Tinnitus J; 2008; 14(1):53-6. PubMed ID: 18616087.
    Abstract:
    Patients with superior semicircular canal dehiscence (SSCD) may have conductive hearing loss (CHL) with normal middle ear (ME). A patient with CHL and normal tympanic membrane at otoscopy underwent tympanotomy for presumed otosclerosis but had negative intraoperative findings. A high-resolution computed tomography (CT) scan of the temporal bone performed a few years later showed the absence of middle-ear disorder (especially the absence of imaging signs of otosclerosis) and revealed a bony dehiscence of the superior semicircular canal. High-resolution CT scan is the test of choice for diagnosing SSCD; it mimics otosclerosis by manifesting itself as CHL with a normal ME. The aim of this study is to remind radiologists and otolaryngologists that SSCD should be systematically considered among the etiologies of CHL with normal ME.
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