Fissula ante fenestram

Case contributed by Dr Azza Elgendy

Patient Data

Age: middle age group
Modality: Annotated image

Fissula ante fenestram lies anterior to the oval window, and parallel to the apical turn of the cochlea.

Case Discussion

HRCT with axial plane lies parallel to the lateral semicircular canal, in the mesotympanium. The important key structures at this level include 3 ossicles( from anterior to posterior malleus manubrium, incus long process and stapes crura), vertibule, footplate of the stapes in the oval window, cochlear( apical turn) and vestibular aqueduct.  The illustration shows the fissula ante fenestram, the bony labyrinth and the space for the membranous labyrinth. The fissula ante fenestram located at the lateral wall of the vestibule( anterior to the oval window) and it stands parallel to the adjacent cochlear turn. Any curvilinear lucency at the fissula ante fenestram, showed be considered as "fenestral otosclerosis" in adult, and "cochlear cleft" should be excluded in pediatric age group.

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Case Information

rID: 33825
Case created: 25th Jan 2015
Last edited: 9th Sep 2015
Inclusion in quiz mode: Excluded

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