Fenestral otosclerosis

Case contributed by Dr Charlie Chia-Tsong Hsu

Presentation

Bilateral conductive hearing loss and worse on the right.

Patient Data

Age: 75
Gender: Male
Modality: CT

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.

Case Discussion

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. 

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Case Information

rID: 33093
Case created: 30th Dec 2014
Last edited: 19th Dec 2015
System: Head & Neck
Inclusion in quiz mode: Included

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