[Superior semicircular canal dehiscence mimicking otosclerosis: usefulness of imaging].
OBJECTIVE
To emphasize the role of computerized tomography (CT) in the etiologic work-up of stapes surgery failure.


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.


CONCLUSIONS
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.
Service d'ORL et chirurgie cervicofaciale, Fondation Adolphe-de-Rothschild, 25-29, rue Manin, 75019 Paris, France.
A
A
El Kohen
C-B
CB
Teszler
M-T
MT
Williams
D
D
Ayache
D003937:Diagnosis, Differential; D004427:Ear Diseases / Q000209:etiology* / Q000601:surgery; D005260:Female; D006801:Humans; D008875:Middle Aged; D010040:Otosclerosis / Q000175:diagnosis*; D011183:Postoperative Complications; D012665:Semicircular Canals / Q000000981:diagnostic imaging* / Q000601:surgery; D013201:Stapes Surgery; D013529:Surgical Wound Dehiscence / Q000000981:diagnostic imaging* / Q000209:etiology / Q000601:surgery; D014057:Tomography, X-Ray Computed