Cochlear incomplete partition type II

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

It should not be confused with Mondini anomaly, which is a historic term for a combination of IP-II and large vestibular aqueduct.

Radiographic features


On CT, the cochlea is seen as having only 1 1/2 turns with coalescence of the apical and middle turn, forming a cystic apex .

Other findings include :


Care should be taken when interpreting MR in isolation for cochlear incomplete partition; it should always be correlated to petrous temporal bone CT-scan .

  • T2: on thin sections, absence of interscalar septum and spiral lamina at the level of apical and middle turns may be seen

See also