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R. Lufkin - One of the best experts on this subject based on the ideXlab platform.
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Narrow, duplicated Internal Auditory Canal
Neuroradiology, 2003Co-Authors: T. Ferreira, B. Shayestehfar, R. LufkinAbstract:A narrow Internal Auditory Canal (IAC) constitutes a relative contraindication to cochlear implantation because it is associated with aplasia or hypoplasia of the vestibulocochlear nerve or its cochlear branch. We report an unusual case of a narrow, duplicated IAC, divided by a bony septum into a superior relatively large portion and an inferior stenotic portion, in which we could identify only the facial nerve. This case adds support to the association between a narrow IAC and aplasia or hypoplasia of the vestibulocochlear nerve. The normal facial nerve argues against the hypothesis that the narrow IAC is the result of a primary bony defect which inhibits the growth of the vestibulocochlear nerve.
H. Oka - One of the best experts on this subject based on the ideXlab platform.
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P11.10 Atypical teratoid/rhabdoid tumor in the Internal Auditory Canal.
Neuro-Oncology, 2017Co-Authors: H. OkaAbstract:AbstractOBJECTIVE: The case of a thirteen-year-old woman showing an atypical teratoid/rhabdoid tumor (AT/RT) primarily occurred in the Internal Auditory Canal was presented. Results: There was a delay in diagnosing AT/RT because of the first histological diagnosis of benign neurofibroma. If we had changed the surgical approach to one which was middle cranial fossa-based or translabyrinthine in the second or third operation, we might have reached an earlier final diagnosis. Although we faced a dilemma about whether to sacrifice facial nerve function for dissection of the tumor, we should have considered the possibility of malignancy at an earlier stage. CONCLUSION: This is a case report of AT/RT in the Internal Auditory Canal presenting with progressive hearing loss as the initial symptom. Although no previous reports of AT/RT primarily occurring in the Internal Auditory Canal are existent, this rare form of the disease should be considered in future evaluations as a differential diagnosis for Internal Auditory Canal tumor.
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A case of atypical teratoid/rhabdoid tumor in the Internal Auditory Canal.
Auris nasus larynx, 2014Co-Authors: Tomoko Yamaguchi, H. Oka, Chihiro Kijima, Hajime Sano, Hiroyuki Watanabe, Makito OkamotoAbstract:Abstract Objective The case of a thirteen-year-old woman showing an atypical teratoid/rhabdoid tumor (AT/RT) primarily occurred in the Internal Auditory Canal was presented. Results There was a delay in diagnosing AT/RT because of the first histological diagnosis of benign neurofibroma. If we had changed the surgical approach to one which was middle cranial fossa-based or translabyrinthine in the second or third operation, we might have reached an earlier final diagnosis. Although we faced a dilemma about whether to sacrifice facial nerve function for dissection of the tumor, we should have considered the possibility of malignancy at an earlier stage. Conclusion This is a case report of AT/RT in the Internal Auditory Canal presenting with progressive hearing loss as the initial symptom. Although no previous reports of AT/RT primarily occurring in the Internal Auditory Canal are existent, this rare form of the disease should be considered in future evaluations as a differential diagnosis for Internal Auditory Canal tumor.
T. Ferreira - One of the best experts on this subject based on the ideXlab platform.
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Narrow, duplicated Internal Auditory Canal
Neuroradiology, 2003Co-Authors: T. Ferreira, B. Shayestehfar, R. LufkinAbstract:A narrow Internal Auditory Canal (IAC) constitutes a relative contraindication to cochlear implantation because it is associated with aplasia or hypoplasia of the vestibulocochlear nerve or its cochlear branch. We report an unusual case of a narrow, duplicated IAC, divided by a bony septum into a superior relatively large portion and an inferior stenotic portion, in which we could identify only the facial nerve. This case adds support to the association between a narrow IAC and aplasia or hypoplasia of the vestibulocochlear nerve. The normal facial nerve argues against the hypothesis that the narrow IAC is the result of a primary bony defect which inhibits the growth of the vestibulocochlear nerve.
Madjid Samii - One of the best experts on this subject based on the ideXlab platform.
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bilateral osteomas arising from the Internal Auditory Canal case report
Neurosurgery, 2008Co-Authors: Venelin Gerganov, Amir Samii, Vincenzo Paterno, Alexandru C Stan, Madjid SamiiAbstract:OBJECTIVE: Osteomas arising from the Internal Auditory Canal and developing in the cerebellopontine angle have rarely been reported. We present the first case of bilateral osteomas in this region and describe our management strategy. CLINICAL PRESENTATION: A 30-year-old woman presented with strong vertigo, tinnitus, and hypacusis on the left side. Brain magnetic resonance imaging and computed tomographic scans displayed bilateral cerebellopontine angle osteomas arising from the Internal Auditory Canal. The larger tumor on the left side was found to be compressing the vestibulocochlear nerve. INTERVENTION: Surgery was performed on the symptomatic side via the retrosigmoid approach, and the tumor was removed completely. The vertigo resolved completely after surgery, and the patient had no further tinnitus attacks. An audiogram showed slightly improved hearing with a mean of 20 dB in the main speech area. CONCLUSION: Osteomas should be considered in patients with bilateral cerebellopontine angle tumors. Surgical removal might provide resolution of symptoms.
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Microendoscopy of the Internal Auditory Canal in Vestibular Schwannoma Surgery
Neurosurgery, 1996Co-Authors: Marcos Tatagiba, Cordula Matthies, Madjid SamiiAbstract:Intraoperative microendoscopy was performed for eight patients to access the fundus of the Internal Auditory Canal after retrosigmoid transmeatal surgery of vestibular schwannomas. The transmeatal procedure is usually limited laterally by the labyrinth block. The restricted opening of the Internal Auditory Canal bears a potential risk of incomplete tumor resection. For eight patients with vestibular schwannomas, intraoperative microendoscopy was performed after tumor resection to expose the "blind" area of the Internal Auditory Canal fundus. An excellent view of the fundus contents was obtained, including Cranial Nerves VII and VIII and the crista transversa. Tumor remnants were not observed in this series. Microendoscopy was shown to be an ideal adjunct to hearing-preserving transmeatal surgery of vestibular schwannomas, enabling the removal of intraCanalicular tumors with direct control of the lateral intraCanalicular nerve portions.
A. G. Cajade-law - One of the best experts on this subject based on the ideXlab platform.
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Anatomy of the facial and vestibulocochlear nerves in the Internal Auditory Canal.
AJNR. American journal of neuroradiology, 1996Co-Authors: David Rubinstein, E J Sandberg, A. G. Cajade-lawAbstract:PURPOSE To define the anatomy of the facial and vestibulocochlear nerves in the Internal Auditory Canal on parasagittal CT scans of cadaveric specimens and to compare this anatomy with findings on in vivo T2-weighted two-dimensional fast spin-echo and three-dimensional turbo spin-echo MR images. METHODS Thirty-eight formalin-fixed cadaveric temporal bones were examined with 1-mm-thick contiguous parasagittal CT sections to determine the anatomy of the nerves in the Internal Auditory Canal. Ten specimens underwent limited dissection. Fourteen Canals in 12 patients were examined with T2-weighted two-dimensional fast spin-echo oblique parasagittal MR imaging and 12 Canals in 8 patients were examined with T2-weighted three-dimensional turbo spin-echo MR imaging. The anatomy depicted on MR images was compared with the cadaveric anatomy. RESULTS On cadaveric specimens, the facial nerve coursed superior and anterior to the vestibulocochlear nerve as a tubular structure throughout the length of the Canal. The vestibulocochlear nerve entered the Canal as a tubular structure but became crescent shaped in cross section in the middle portion of the Canal and separated into individual nerves only in the most lateral portion of the Canal. The anatomy of the nerves differed among the specimens. Similar anatomy was demonstrated by MR imaging. CONCLUSION The ability to define the nerves in the Internal Auditory Canal in the parasagittal plane may provide greater sensitivity and specificity in identifying abnormalities of this anatomic structure.