Narrow Duplicated or Triplicated Internal Auditory Canal (3 Cases and Review of Literature)

Lee, Seung Young; Cha, Sang-Hoon; Jeon, Min Hee; Bae, Il Heon; Han, Gi Seok; Kim, Sung Jin; Park, Kil Sun

doi:10.1097/rct.0b013e31818d8ba5

Cited by 15 publications

(5 citation statements)

References 17 publications

(5 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…DIAC affects ears unilaterally, and rarely occurs in bilateral ears (19). It can present as an isolated finding (79), occasionally associated with other temporal malformations (1518) or can form part of some syndromes, such as Klippel-Feil syndrome (11) and pontine tegmental cap dysplasia (2223). In our patient series, 100% (13 ears) of DIACs were accompanied by temporal malformations, including 100% inner ear malformations, 15.4% middle ear anomalies, and 15.4% outer ear anomalies, but these cases did not have other syndromes.…”

Section: Discussionmentioning

confidence: 99%

“…A duplicated internal auditory canal (DIAC) is a rare subtype of internal auditory canal (IAC) anomalies and is usually associated with ipsilateral congenital sensorineural hearing loss (SNHL). Thus far, 44 DIAC cases have been reported (123456789101112131415161718192021222324), but reports on their imaging features are limited. DIAC is frequently misdiagnosed as IAC stenosis in clinical practice because of lack of knowledge about its imaging features (91321).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Duplicated Internal Auditory Canal: High-Resolution CT and MRI Findings

Wang

Zhang

et al. 2019

Korean J Radiol

View full text Add to dashboard Cite

Objective To summarize the high-resolution computed tomography (HRCT) and magnetic resonance imaging (HRMRI) features of duplicated internal auditory canals (DIACs). Materials and Methods Ear HRCT data of 64813 patients with sensorineural hearing loss (SNHL), obtained between August 2009 and November 2017, were reviewed. Among these patients, 12 (13 ears) were found to have DIACs, 9 of whom underwent HRMRI. Their images were evaluated by two otoradiologists. Results The rate of occurrence of DIAC among SNHL patients was 0.019% (12/64813). 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. All of the anterosuperior canals extended into the facial nerve (FN) canal, except for 1, which also extended to the vestibule. The posteroinferior canals ended in the cochlea and vestibule, except for 2, which also connected to the FN canals. Magnetic resonance images revealed that 77.8% (7/9) and 22.2% (2/9) of vestibulocochlear nerves (VCNs) were aplastic and hypoplastic, respectively. Furthermore, 88.9% (8/9) of FNs were normal, except for 1, which was hypoplastic. 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). Malformations of other systems were not found. Conclusion Double-canal appearance is a characteristic finding of DIAC on HRCT, and it is usually accompanied by other ear anomalies. The VCN usually appears aplastic, with a normal FN, on HRMRI.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Duplicated Internal Auditory Canal: High-Resolution CT and MRI Findings

Wang

Zhang

et al. 2019

Korean J Radiol

View full text Add to dashboard Cite

show abstract

“… 1 Usually these cases are unilateral, however, few bilateral cases and a case of triplicated IAC have been reported. 2 , 3 Duplication of IAC is detected on High-Resolution Computed Tomography (HRCT) of the temporal bone, which could either be a partial or complete bony septum. 4 On magnetic resonance imaging (MRI), the vestibulocochlear nerve can be aplastic or hypoplastic.…”

Section: Introductionmentioning

confidence: 99%

Internal auditory canal duplication with facial and cochlear nerve dysfunction: A case report

Ghising,

Dongol,

Suwal

2023

SAGE Open Medical Case Reports

View full text Add to dashboard Cite

Internal auditory canal duplication is a rare anomaly of the temporal bone. The condition is diagnosed on performing High-Resolution Computed Tomography of the temporal bone and magnetic resonance imaging for sensorineural hearing loss. A bony septum divides the internal auditory canal into dual compartments. Duplication may be either unilateral or bilateral and vestibulocochlear nerve may be aplastic or hypoplastic. Rarely, patient may present with facial nerve palsy. A 26-year-old female presented with right grade IV lower motor neuron facial nerve palsy for 12 years and right-sided hearing loss for 9 years. Pure tone audiogram revealed 45 dB of moderate degree sensorineural hearing loss on the right ear. On High-Resolution Computed Tomography of the temporal bone, an incomplete bony septum was visualized in the right internal auditory canal, dividing it into two compartments. Internal auditory canal on the left side was normal. Other inner and middle ear structures were normal. On magnetic resonance imaging, both the vestibulocochlear and facial nerves were well visualized with normal calibers.

show abstract

“…Compared to other imaging techniques, such as high-resolution computed tomography (HRCT), MRI is considered the gold standard of CND diagnosis (Adunka et al, 2007; Buchman et al, 2006; Lee et al, 2009; McClay et al, 2008; Parry, 2005). However, in some cases, even MRI may not provide enough information to make a decision about information in your child and be limited in determination of an accurate diagnosis of CND.…”

Section: Introductionmentioning

confidence: 99%