Bilateral conductive hearing loss and worse on the right.
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HRCT temporal bone coronal image (A) demonstrates radiolucent halo anterior to the oval window and more pronounced on the right. The tympanic segment of the facial nerve is labelled (*). Axial images (B and C) again shows bilateral radiolucent plaques in the location of the fissula ante fenestram characteristic of fenestral otosclerosis.
Fenestral otosclerosis is the most common cause of conductive hearing loss in adults and is bilateral in 80% of cases. Early CT changes may subtle as seen in this example on the left side.