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Published on: February 29, 2020
[Superior semicircular canal dehiscence mimicking otosclerosis: usefulness of imaging]
A El Kohen1, C-B Teszler, M-T Williams
1Service d'ORL et chirurgie cervicofaciale, Fondation Adolphe-de-Rothschild, 25-29, rue Manin, 75019 Paris, France.
Objectives:
To emphasize the role of computerized tomography (CT) in the etiologic work-up of stapes surgery failure.
Material And Methods:
Helical high resolution CT scan of the temporal bone with axial and coronal views and multiplanar reconstructions was performed in a patient who had undergone unsuccessful stapedectomy.
Results:
CT scan demonstrated a well located prosthesis, the absence of the radiological hallmarks of otosclerosis, and revealed a superior semicircular canal dehiscence (SSCD). The diagnosis of SSCD was retrospectively considered accountable for the preoperative clinical and audiometric presentation that had mimicked otosclerosis.
Conclusion:
CT is the diagnostic test of choice in elucidating stapes surgery failure (with persistent or recurrent conductive hearing loss), whereas SSCD should be systematically considered among its causes.
