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![]() ![]() Oblique axial and parasagittal MR images reveal that left dysplastic VCN (short arrows) and normal FN enter anterosuperior canal (long arrow).MRI and CT are complementary in the pre-operative work-up. Posteroinferior canal ends in cochlea (short arrow) and vestibule (long arrow). Anterosuperior canal is connected to FN canal (short arrow) and to vestibule (long arrow). Oblique coronal HRCT image shows that bony septum has medial (short arrow) and lateral (long arrow) defects. CT volume rendering image shows meatus of double canals and bony septum (arrow).įig. FN canal is continuous with anterosuperior canal (short arrow) and with posteroinferior canal through accessory canal (long arrow). Oblique coronal and parasagittal HRCT images show that IAC is divided into two portions by complete oblique bony septum (arrows). 3 4-month-old female with right DIAC.A, B. Latter has migrated beneath trigeminal nerve (long arrows). Oblique axial and parasagittal MR images reveal left aplastic VCN and normal FN (short arrows). CT volume rendering image clearly shows that FN canal meatus is anteriorly and superiorly located (arrow). Posterior canal ends in cochlea and vestibule, and ipsilateral bony CN canal is stenotic (arrow). Anterior canal is connected to FN canal (arrow). Oblique coronal and parasagittal HRCT images clearly show complete and nearly vertical bony septum (arrows). CN = cochlear nerve, CT = computed tomography, DIAC = duplicated internal auditory canal, FN = facial nerve, HRCT = high-resolution CT, IAC = internal auditory canal, VCN = vestibulocochlear nerveįig. Oblique axial and parasagittal MRI show that right VCN (short arrow) is aplastic and FN (long arrows) is normal in cisternal segment. CT volume rendering image shows bony septum (arrow). Ipsilateral bony CN canal is narrow (long arrow). Superior portion is connected to FN canal (arrows), whereas inferior portion is connected to cochlea and vestibule (short arrow). Oblique coronal and parasagittal HRCT images show that IAC is divided into double canals by complete horizontal bony septum (arrows). The VCN usually appears aplastic, with a normal FN, on HRMRI.įig. CONCLUSION Double-canal appearance is a characteristic finding of DIAC on HRCT, and it is usually accompanied by other ear anomalies. Malformations of other systems were not found. All of the affected ears also had other ear anomalies: a narrow, bony cochlear nerve canal was the most common other anomaly, accounting for 92.3% (12/13). Furthermore, 88.9% (8/9) of FNs were normal, except for 1, which was hypoplastic. Magnetic resonance images revealed that 77.8% (7/9) and 22.2% (2/9) of vestibulocochlear nerves (VCNs) were aplastic and hypoplastic, respectively. The posteroinferior canals ended in the cochlea and vestibule, except for 2, which also connected to the FN canals. All of the anterosuperior canals extended into the facial nerve (FN) canal, except for 1, which also extended to the vestibule. The internal auditory canals of 13 ears were divided into double canals by complete (n = 6) and incomplete (n = 7) bony septa, with varied orientations ranging from horizontal to approximately vertical. RESULTS The rate of occurrence of DIAC among SNHL patients was 0.019% (12/64813). Their images were evaluated by two otoradiologists. Among these patients, 12 (13 ears) were found to have DIACs, 9 of whom underwent HRMRI. MATERIALS AND METHODS Ear HRCT data of 64813 patients with sensorineural hearing loss (SNHL), obtained between August 2009 and November 2017, were reviewed. Abstract OBJECTIVE To summarize the high-resolution computed tomography (HRCT) and magnetic resonance imaging (HRMRI) features of duplicated internal auditory canals (DIACs).
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