Otosclerosis - fenestral

Case contributed by Frank Gaillard
Diagnosis almost certain
  • Note: This case has been tagged as "legacy" as it no longer meets image preparation and/or other case publication guidelines.
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A small region of lucency (demineralization) just anterior to the oval window is characteristic of fenestral otosclerosis. 

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Fenestral otosclerosis (arrow) as denoted by a small region of lucency (demineralization) just anterior to the oval window, involving a small cleft known as the fissula ante fenestram.

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