Cochlear implant assessment: imaging issues

Marsot-Dupuch, K; Meyer, B.

doi:10.1016/s0720-048x(01)00380-1

Cited by 35 publications

(23 citation statements)

References 16 publications

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“…There are many factors that should be considered for cochlear implant candidacy such as age, mental and physical health, audiological testing, cause and duration of deafness, capacity and ability to be reeducated, and social status (5,9). In addition, one may have to perform cochlear implantation in rare instances.…”

Section: Discussionmentioning

confidence: 99%

Cochlear Implantation in Extraordinary Cases

Çelenk¹,

Cevizci²,

Altınyay³

et al. 2015

Balkan Med J

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Although cochlear implantation has been almost a standard otological procedure worldwide, it may still create a dilemma for the surgeon in some unusual instances such as Seckel syndrome, the presence of a cardiac pacemaker for complete atrioventricular block, aural atresia, and in the presence of concurrent pathologies.Seckel syndrome is a rare constellation of malformations which is presumably inherited as an autosomal recessive trait. The primary characteristic features of Seckel syndrome are: intrauterine and postnatal dwarfism, severe microcephaly, orofacial dysmorphism with characteristic "Bird-headed" appearance, prominent beaked nose, micrognathia, variable mental retardation and the presence of other malformations, especially of the skeleton (1,2). Abnormalities associated with cardiovascular, hematopoietic, endocrine and central nervous systems were also reported in Seckel syndrome (3).Congenital aural atresia is a relatively common congenital anomaly in otology. It is estimated to occur in approximately 1 out of every 10,000 to 20,000 births. Hypoplasia of the external auditory canal, often associated with abnormalities of the auricle, middle ear and the inner ear structures, is the characteristic feature of aural atresia (4,5). It is unilateral in 70% to 85% of cases and the right ear is affected more frequently than the left (6). Intracranial arachnoid cysts are presumably congenital malformations that are believed to form by the splitting of the arachnoid membrane because of a circumscribed increased pulsation of the cerebrospinal fluid (7,8). Arachnoid cysts constitute approximately 1% of all intracranial lesions. The most common location of these lesions is the middle cranial fossa, with the posterior fossa being the second most common location. The clinical entities presented above are rare, and cochlear implantation in these entities is an extraordinary Background: Although cochlear implantation has been almost a standard otological procedure worldwide, it may still create a dilemma for the surgeon in some unusual instances such as Seckel syndrome, aural atresia and posterior fossa arachnoid cyst. Case Report: Three extraordinary cases of cochlear implantation were reported. The first case was a case of Seckel syndrome with a cardiac pacemaker due to complete atrioventricular block. The second case had posterior fossa arachnoid cyst that had retrosigmoid cyst removal and cochlear implantation simultaneously. The last case had cochlear implantation in the ear with congenital aural atresia. All cases could be implanted successfully with full electrode insertion and good audiological outcome. Delayed facial paralysis that occurred in the patient with arachnoid cyst resolved spontaneously. Conclusion: This study addressed the efficiency of cochlear implantation in cases of Seckel syndrome, complete atrioventricular block managed with cardiac pacemaker, congenital aural atresia and posterior fossa arachnoid cyst. In addition, the retrosigmoid approach and cochlear implantation can be performed simult...

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Section: Discussionmentioning

confidence: 99%

Cochlear Implantation in Extraordinary Cases

Çelenk¹,

Cevizci²,

Altınyay³

et al. 2015

Balkan Med J

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“…MRI has thus been used as the imaging method of choice for assessing spiral canal obstructions, especially in candidates for cochlear implants. [4][5][6][7][8][9][10][11][12][13][14] Three-dimensional MRI provided high quality images of the spiral canal of cochlea in our cadaver temporal bone cases.…”

Section: Discussionmentioning

confidence: 99%

“…Computed tomography (CT) and magnetic resonance imaging (MRI) are currently used for this evaluation. [2][3][4][5][6][7][8][9][10][11][12][13] Jackler et al 2 found a 46% rate of false negative results when comparing the results of high resolution CT with surgical findings in 36 ears with implants. Nikolopoulos et al 3 concluded that the sensitivity rate was about 62.5% in a study of 108 children.…”

Section: Introductionmentioning

confidence: 99%

“…4 Currently, MRI is the image method of choice for assessing spiral canal of cochlea obstructions. [5][6][7][8][9][10][11][12][13][14][15] Casselman et al 5 were the first to apply CISS-3DFT MRI (constructive interference in steady state -threedimensional Fourier transformation magnetic resonance imaging) in the study of the inner ear and the cerebellopontine angle. A study of 50 normal ears and 10 diseased ears showed detailed images of the cochlear, semicircular canals, the vestibule, and the facial and vestibulocochlear cranial nerves.…”

Section: Introductionmentioning

confidence: 99%

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Método para medida do comprimento da cóclea por meio de ressonância magnética

Sobrinho

Lazarini²,

Yoo³

et al. 2009

Rev. Bras. Otorrinolaringol.

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We know that hearing impairment affects a large part of the population. In cases of profound and bilateral hearing loss, children may have problems in speech development, as well as communication and socialization. Cochlear implants have been used as a treatment option in these cases. Today, inner ear MRI is a mandatory test in the preoperative evaluation of these individuals. In our daily routines, we wonder whether MRI can provide not only qualitative, but also quantitative data, with real cochlear linear values built from three dimension images. Aims: The aim of the present investigation is to propose a method to obtain MRI cochlear length measures from the temporal bones of cadavers. Material and Methods:We assessed three dimensional images from the cochlea of six cadavers. By overlapping digitalized rulers on these images it was possible to measure cochlear length. Results: These measures varied between 17 and 26.5 millimeters. Conclusions: We have concluded that it was possible to measure cochlear length from three dimensional MRI images, by employing the method hereby proposed.

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“…MRI might add information on the cochlear patency, the cochlear nerve and the anatomy of the central acoustic pathway, from the cochlear nuclei to the temporal acoustic area [21].…”

Section: Discussionmentioning

confidence: 99%

Cochlear Orientation and Dimensions of the Facial Recess in Cochlear Implantation

Bettman¹,

Appelman

Olphen³

et al. 2003

ORL

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Objective: To study the dimensions of the facial recess and the spatial relationship between the facial recess and the cochlea, using CT scanning in cochlear implantees. Method: In 29 cochlear implantees, preoperative CT scans of the temporal bone were compared with findings done at surgery. The dimensions of the facial recess and the relationship between the facial recess and the cochlea were both measured on a viewing station and classified on printed films by 3 blinded and independent reviewers. Results: No significant relations could be found between either intuitive classification of facial recess width or electrode array insertion feasibility and the measurements with the viewing station. The 3 reviewers had large interobserver variability. In 5 cases, neither intuitive review of the CT scans nor viewing station measurements could predict any of the problems encountered during surgery. Conclusion: Our findings show that intuitive review was not reliable in classifying facial recess width. Viewing station measurements, in classifying the spatial relation between the facial recess and the cochlear basal turn, need a more detailed review in terms of the relationship with the operation direction and the orientation of the basal turn of the cochlea. Advanced imaging techniques, specifically multislice CT, might improve the diagnostic capabilities.

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Cochlear implant assessment: imaging issues

Cited by 35 publications

References 16 publications

Cochlear Implantation in Extraordinary Cases

Cochlear Implantation in Extraordinary Cases

Método para medida do comprimento da cóclea por meio de ressonância magnética

Cochlear Orientation and Dimensions of the Facial Recess in Cochlear Implantation

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