Cochlear incomplete partition type II
Updates to Article Attributes
Cochlear incomplete partition type II (IP-II) is is a type of inner ear malformation, specifically a cochlear incomplete partition, associated associated with sensorineural hearing loss. It is characterizedcharacterised by a cystic cochlear apex and should not be confused with Mondini anomaly, which is a historic term for the combination of incomplete partition type II, enlarged vestibule, and large vestibular aqueduct.
Radiographic features
CT
The cochlea appears to have only 1.5 turns with coalescence of the apical and middle turn to form a cystic apex 1. The basal turn is normal, while these findings affect the middle and apical turns 2:
- absent interscalar septum
- absent osseous spiral lamina
- deficient modiolus
Incomplete partition type II is usually, but not always, associated with the extracochlear findings that contribute to the full Mondini anomaly:
- large vestibular aqueduct
- enlarged vestibule
MR
Care should be taken when interpreting MR in isolation for cochlear incomplete partition; it should always be correlated to petrous temporal bone CT-scan 3.
- T2: on thin sections, absence of interscalar septum and spiral lamina at the level of apical and middle turns may be seen 1
See also
-<p><strong>Cochlear incomplete partition type II </strong>(IP-II) is a type of <a href="/articles/inner-ear-malformations-classification">inner ear malformation</a>, specifically a <a title="Cochlear incomplete partition" href="/articles/cochlear-incomplete-partition">cochlear incomplete partition</a>, associated with <a href="/articles/sensorineural-hearing-loss">sensorineural hearing loss</a>. It is characterized by a cystic cochlear apex and should not be confused with <a href="/articles/mondini-malformation">Mondini anomaly</a>, which is a historic term for the combination of incomplete partition type II, enlarged <a href="/articles/vestibule-ear">vestibule</a>, and <a href="/articles/large-vestibular-aqueduct-syndrome-1">large vestibular aqueduct</a>.</p><h4>Radiographic features</h4><h5>CT</h5><p>The cochlea appears to have only 1.5 turns with coalescence of the apical and middle turn to form a cystic apex <sup>1</sup>. The basal turn is normal, while these findings affect the middle and apical turns <sup>2</sup>:</p><ul>- +<p><strong>Cochlear incomplete partition type II </strong>(IP-II) is a type of <a href="/articles/inner-ear-malformations-classification">inner ear malformation</a>, specifically a <a title="Cochlear incomplete partition" href="/articles/cochlear-incomplete-partition">cochlear incomplete partition</a>, associated with <a href="/articles/sensorineural-hearing-loss">sensorineural hearing loss</a>. It is characterised by a cystic cochlear apex and should not be confused with <a href="/articles/mondini-malformation">Mondini anomaly</a>, which is a historic term for the combination of incomplete partition type II, enlarged <a href="/articles/vestibule-ear">vestibule</a>, and <a href="/articles/enlarged-vestibular-aqueduct">large vestibular aqueduct</a>.</p><h4>Radiographic features</h4><h5>CT</h5><p>The cochlea appears to have only 1.5 turns with coalescence of the apical and middle turn to form a cystic apex <sup>1</sup>. The basal turn is normal, while these findings affect the middle and apical turns <sup>2</sup>:</p><ul>
-<li>deficient <a href="/articles/modiolus">modiolus</a>- +<li>deficient <a href="/articles/modiolus-cochlea">modiolus</a>
Image 1 CT (bone window) ( create )
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