Unilateral enlargement of the internal auditory canal: A developmental variant

Weinberg, Peter E.; Kim, Kwang S.; Gore, Richard M.

doi:10.1016/s0090-3019(81)80088-2

Cited by 16 publications

(11 citation statements)

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“…Weinberg postulated a developmental disorder of the temporal bone leading to IAC enlargement [14]. Kokai's 2003 publication on a CT-based analysis of inner ear malformation reports anomalies of the labyrinthine structures as most frequent and narrow IAC with an occurrence of 2 % but no IAC enlargement [15].…”

Section: Kernaussagenmentioning

confidence: 99%

“…An intact crista falciformis and absent cortical destruction led to the interpretation of a developmental anomaly. Already in the era of conventional X-ray tomography, Weinberg differentiated between constitutional IAC enlargement and the mostly bilateral patulous internal auditory canal which is characterized by an increased height in the middle of the IAC in contrast to the enlargement of the posterior IAC in the developmental variant [14]. In 2003 Migirov analyzed the frequency and clinical relevance of the patulous IAC using a large number of high-resolution CT scans.…”

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confidence: 99%

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Nontumorous Enlargement of the Internal Auditory Canal: A Risk Factor for Sensorineural Hearing Loss? A High Resolution CT-Study

Stimmer

Niedermeyer

Kehl

et al. 2015

Fortschr Röntgenstr

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Purpose: First aim of the study was to define normal shape and diameter of the internal auditory canal (IAC). In the second part the clinical relevance of IAC-enlargement was analyzed, considering also lesions of the subtle structures at the fundus of the internal auditory canal. Materials and Methods: 440 high resolution CT-scans of the temporal bone were used for retrospective analysis of the internal auditory canal and its fundus region. Results: The mean value of the IAC diameter in axial and coronal plane was determined. In 20 of 440 patients IAC enlargement was found. In the group with pronounced enlargement (3fold SD) nearly all patients suffered from hearing impairment. In some of them we found structural abnormalities near the IAC fundus in the CSF/perilymph border zone. Conclusion: A new CT-based definition of normal shape and diameter of the internal auditory canal is presented. There is some evidence that a pathologic transmission of CSF-pressure in case of IAC-enlargement and/or abnormal fistulous communications could play an important role in the pathophysilogy of hearing loss. Key points: ??New CT-based definition of normal internal auditory canal. ??Nearly all patients showing pronounced IAC-enlargement suffer from hearing impairment. ??Possible pathomechanism: Transmission of CSF-pressure on the inner ear. Citation Format: ??Stimmer H, Niedermeyer HP, Kehl V et?al. Nontumorous Enlargement of the Internal Auditory Canal: A Risk Factor for Sensorineural Hearing Loss? A High Resolution CT-Study. Fortschr R?ntgenstr 2015; 187: 450???458

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Section: Kernaussagenmentioning

confidence: 99%

mentioning

confidence: 99%

Nontumorous Enlargement of the Internal Auditory Canal: A Risk Factor for Sensorineural Hearing Loss? A High Resolution CT-Study

Stimmer

Niedermeyer

Kehl

et al. 2015

Fortschr Röntgenstr

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“…In all reported cases of this condition, patulous internal auditory canal was not combined with any anomaly of the labyrinth. 3,4 The pathogenetic mechanism of the hearing impairment caused by enlarged internal auditory canal is not well defined and is a subject of debate. However, the present case seems to suggest a new potential pathogenetic mechanism.…”

Section: Discussionmentioning

confidence: 99%

Enlarged internal auditory canal and sudden deafness

et al. 2010

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“…The IAC is considered widened if it is greater than 9 mm in vertical dimension and is most often an incidental finding in normal, healthy individuals [4,13]. There have been isolated case reports of dilated lateral IACs in patients with sensorineural hearing loss and mixed hearing loss, without any causal relationship [1,14]. Recognizing the presence of a wide IAC can be clinically important as it has been associated with a stapes 'gusher' during a stapedotomy procedure for otosclerosis [13].…”

Section: Discussionmentioning

confidence: 99%