Cochlear incomplete partition type I

Cochlear incomplete partition type I  (IP-I) is a type of cochlear anomaly associated with sensorineural hearing loss.

The main findings on CT are:

Absence of these structures gives a cystic appearance to the cochlea. However, IP-I is a spectrum that varies from mild to severe, with variable cochlear external contour and variable associated abnormality of the vestibule and semicircular canal.

In the mildest form, abnormalities are isolated to the cochlea, with lack of modiolus and interscalar septum.

In-between the mild and the severe form lies a spectrum of associated vestibular and semicircular canal dilatation.

In the severe form (also known as cystic cochleovestibular malformation), the cochlea is featureless, and both the cochlea and vestibule are cystic. This appearance has been likened to a figure 8 morphology.

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Article information

rID: 47545
Section: Pathology
Tag: cases
Synonyms or Alternate Spellings:
  • Type I incomplete partition
  • cystic cochleovestibular malformation
  • IP-I
  • cystic cochleovestibular syndrome

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