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PT  - JOURNAL ARTICLE
AU  - Reinshagen, K.L.
AU  - Curtin, H.D.
AU  - Quesnel, A.M.
AU  - Juliano, A.F.
TI  - Measurement for Detection of Incomplete Partition Type II Anomalies on MR Imaging
AID  - 10.3174/ajnr.A5335
DP  - 2017 Oct 01
TA  - American Journal of Neuroradiology
PG  - 2003--2007
VI  - 38
IP  - 10
4099  - http://www.ajnr.org/content/38/10/2003.short
4100  - http://www.ajnr.org/content/38/10/2003.full
SO  - Am. J. Neuroradiol.2017 Oct 01; 38
AB  - BACKGROUND AND PURPOSE: Incomplete partition type II of the cochlea, commonly coexisting with an enlarged vestibular aqueduct, can be a challenging diagnosis on MR imaging due to the presence of a dysplastic spiral lamina–basilar membrane neural complex, which can resemble the normal interscalar septum. The purpose of this study was to determine a reproducible, quantitative cochlear measurement to assess incomplete partition type II anomalies in patients with enlarged vestibular aqueducts using normal-hearing ears as a control population.MATERIALS AND METHODS: Retrospective analysis of 27 patients with enlarged vestibular aqueducts (54 ears) and 28 patients (33 ears) with normal audiographic findings who underwent MR imaging was performed. Using reformatted images from a cisternographic 3D MR imaging produced in a plane parallel to the lateral semicircular canal, we measured the distance (distance X) between the osseous spiral lamina-basilar membrane complex of the upper basal turn and the first linear signal void anterior to the basilar membrane.RESULTS: The means of distance X in patients with normal hearing and prospectively diagnosed incomplete partition type II were, respectively, 0.93 ± 0.075 mm (range, 0.8–1.1 mm) and 1.55 ± 0.25 mm (range, 1–2.1 mm; P &amp;lt; .001). Using 3 SDs above the mean of patients with normal hearing (1.2 mm) as a cutoff for normal, we diagnosed 21/27 patients as having abnormal cochleas; 4/21 were diagnosed retrospectively. This finding indicated that almost 20% of patients were underdiagnosed. Interobserver agreement with 1.2 mm as a cutoff between normal and abnormal produced a κ score of 0.715 (good).CONCLUSIONS: Incomplete partition type II anomalies on MR imaging can be subtle. A reproducible distance X of ≥1.2 mm is considered abnormal and may help to prospectively diagnose incomplete partition type II anomalies.DRIVEdriven equilibriumEVAenlarged vestibular aqueductIP-IIincomplete partition type II