Fenestral otosclerosis

Case contributed by Assoc Prof Frank Gaillard

Presentation

Left sided hearing loss.

Patient Data

Age: Adult

CT temporal bones

CT

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.

Annotated

Diagram

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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