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fissula ante fenestram


Definition: minute, slitlike passage in the otic labyrinthine wall anterior to the oval window to the vestibule. The bone around it often contains fibrous tissue and immature cartilage. It is a site with a predilection for otosclerosis and for some perilymphatic fistulae.

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.