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ORIGINAL RESEARCH HEAD & NECK Prevalence of Internal Auditory Canal Diverticulum and Its Association with Hearing Loss and Otosclerosis X K.J. Pippin, X T.J. Muelleman, X J. Hill, X J. Leever, X H. Staecker, and X L.N. Ledbetter ABSTRACT BACKGROUND AND PURPOSE: Focal low-attenuation outpouching or diverticulum at the anterolateral internal auditory canal is an uncommon finding on CT of the temporal bone. This finding has been described as cavitary otosclerosis in small case reports and histology series. The purpose of this study was to establish the prevalence of internal auditory canal diverticulum and its association with classic imaging findings of otosclerosis and/or hearing loss. MATERIALS AND METHODS: Temporal bone CT scans of 807 patients, obtained between January 2013 and January 2016, were retrospec- tivelyreviewedtoidentifyinternalauditorycanaldiverticulaand/orclassicimagingfindingsofotosclerosis.Clinicalevaluationsforhearing loss were reviewed for patients with internal auditory canal diverticula and/or otosclerosis. RESULTS: Internal auditory canal diverticula were found in 43 patients (5%); classic otosclerosis, in 39 patients (5%); and both findings, in 7 patients (1%). Most temporal bones with only findings of internal auditory canal diverticula (91%) demonstrated hearing loss, with 63% of thisgroupdemonstratingsensorineuralhearingloss.Thehearinglossclassificationdistributionwassignificantlydifferent(P.01)fromthat in the classic otosclerosis group and in the group with both diverticula and otosclerosis. CONCLUSIONS: Internal auditory canal diverticula
American Journal of Neuroradiology – American Journal of Neuroradiology
Published: Nov 1, 2017
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