Fenestral otosclerosis

Case contributed by Frank Gaillard
Diagnosis almost certain


Left sided hearing loss.

Patient Data

Age: Adult

CT temporal bones


CT through the left temporal bone demonstrates a circumscribed region of demineralization immediately anterior to the oval window, in the bone between the cochlea and vestibule.



The stapes' footplate fills the oval window. Immediately anterior to it is a region of lucency. 

Case Discussion

This is a characteristic appearance for fenestral otosclerosis. It is a subtle finding which is often bilateral. As such getting used to the normal appearance of this region is essential if the diagnosis is to be made. 

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