Citation, DOI, disclosures and article data
Citation:
St-Amant M, Deng F, Sharma R, et al. Cochlear incomplete partition type II. Reference article, Radiopaedia.org (Accessed on 25 Mar 2025) https://doi.org/10.53347/rID-55582
Cochlear incomplete partition type II (IP-II) is a type of inner ear malformation, specifically a cochlear incomplete partition, characterized by absence of the interscalar septum between the upper turns of the cochlea.
Clinical presentation
Patients have sensorineural hearing loss.
Radiographic features
CT
The basal turn is normal, while these findings affect the middle and apical turns 1-4:
Incomplete partition type II is usually, but not always, associated with the extracochlear findings that contribute to the full Mondini anomaly:
MRI
Care should be taken when interpreting MRI in isolation for cochlear incomplete partition; it should always be correlated to petrous temporal bone CT 3.
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1. Joshi VM, Navlekar SK, Kishore GR, Reddy KJ, Kumar EC. CT and MR imaging of the inner ear and brain in children with congenital sensorineural hearing loss. Radiographics : a review publication of the Radiological Society of North America, Inc. 32 (3): 683-98. doi:10.1148/rg.323115073 - Pubmed
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2. Yiin RS, Tang PH, Tan TY. Review of congenital inner ear abnormalities on CT temporal bone. The British journal of radiology. 84 (1005): 859-63. doi:10.1259/bjr/18998800 - Pubmed
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3. Leung KJ, Quesnel AM, Juliano AF, Curtin HD. Correlation of CT, MR, and Histopathology in Incomplete Partition-II Cochlear Anomaly. Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology. 37 (5): 434-7. doi:10.1097/MAO.0000000000001027 - Pubmed
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4. D’Arco F, Kandemirli S, Dahmoush H et al. Incomplete Partition Type II in Its Various Manifestations: Isolated, in Association with EVA, Syndromic, and Beyond; a Multicentre International Study. Neuroradiology. 2024;66(8):1397-403. doi:10.1007/s00234-024-03386-z - Pubmed
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