Common cavity malformation

Common cavity malformation is defined by the absence of the normal differentiation between the cochlea and vestibule replaced by cystic structure. It accounts for about 25% of cochlear malformations 1

  • confluence of the cochlea, vestibule and horizontal SCC in a cystic cavity variable in size with no internal architecture
  • the width of the cavity is typically greater than its height, with the average vertical diameter being 7 mm, and the average horizontal diameter, 10 mm 1
  • posterior and superior SCC are absent, normal or malformed
  • CN8: small or absent components
  • facial nerve canal: anomalous course
  • ossicles: normal or anomalous stapes & stenotic oval window
  • vestibular aqueduct: not dilated, may be absent
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Article Information

rID: 47543
System: Head & Neck
Section: Pathology
Tag: cases
Synonyms or Alternate Spellings:

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