Magnetic Resonance Imaging and High-Resolution Computed Tomography in the Otospongiotic Phase of Otosclerosis

Stimmer, Herbert; Arnold, W.; Schwaiger, Markus; Laubenbacher, C.

doi:10.1159/000067565

Cited by 25 publications

(19 citation statements)

References 7 publications

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“…Otosclerosis is a bone dysplasia that exclusively affects the human temporal bone, causing 2% of hearing losses between the ages of 30 and 59 [Stimmer et al, 2002], although the onset of clinical otosclerosis is between the ages of 20 and 30 [Niedermeyer and Arnold, 2002]. This bone dysplasia leads to a bilateral sensorineural or mixed hearing loss, tinnitus and episodes of sudden hearing loss [Arnold et al, 1999].…”

Section: Introductionmentioning

confidence: 99%

Otosclerosis: Mid-Term Results of Cochlear Implantation

et al. 2007

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Introduction: Constant histological changes in otosclerosis lead to progressive hearing loss which may end up in a profound hearing loss and then be treated by means of cochlear implants. These progressive changes could be followed by changes in cochlear implants fitting and speech discrimination results over the years. Objectives: The aim of the study is to correlate the progressive histological changes to the cochlear implant clinical outcomes (fitting and speech discrimination results). Also main complications (facial nerve stimulation and difficulties at insertion) and new complications will be discussed. Design: A 5-year prospective case-control study was performed in order to compare cochlear implant results in otosclerosis patients to those in a matched-pair control group. Materials and Methods: Fifteen otosclerosis patients were followed throughout the study. Preoperatively temporal bone high-resolution computed tomography, electrically evoked auditory brainstem responses and speech discrimination tests were performed in order to select the patients to be implanted. Results: Not only difficulties with electrode guide insertion were reported, but also difficulties with fitting over the years, due to increasing difficulties to spread the electrical stimuli, which provokes increasing thresholds, maximum comfort levels and charges needed to stimulate hearing cells in basal and medial turn electrodes (p < 0.05), which required deactivating some basal and medial turn electrodes in order to improve cochlear implant effectiveness. The results demonstrated no statistical differences in speech discrimination in otosclerosis patients compared to the control group (p > 0.05). Several complications were reported: facial nerve stimulation (7.14%) and sudden episodes of tinnitus and headaches (14.28%). Conclusions: Although progressive histological changes in otosclerosis lead to increasing thresholds, maximum comfort levels and charges needed to stimulate hearing cells, speech discrimination results support the cochlear implantation in otosclerosis.

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Section: Introductionmentioning

confidence: 99%

Otosclerosis: Mid-Term Results of Cochlear Implantation

et al. 2007

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“…Otosclerosis is diagnosed based on the patient's clinical history, physical findings, audiometric testing, and radiological examinations [3][4][5][6][7][8][9][10][11]. Computed tomography (CT) and magnetic resonance imaging (MRI) have been reported to be useful for the diagnosis of otosclerosis [4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Relationship between CT densitometry with a slice thickness of 0.5 mm and audiometry in otosclerosis

et al. 2006

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The appropriate cutoff Hounsfield unit (HU) value for the diagnosis of otosclerosis was determined and the correlation between the bone conduction threshold and the findings of computed tomography (CT) densitometry investigated. CT images, 0.5-mm thick, were evaluated in 24 ears with otosclerosis and 19 control ears. Eight regions of interest were set around the otic capsule. The mean HU values in the area anterior to the oval window (A-OW) and anterior to the internal auditory canal (A-IAC) were significantly lower in otosclerosis than in controls. Based on receiver operating characteristic (ROC) analysis, the cutoff HU value in A-OW was determined to be 2,187.3 HU. The mean HU value in retrofenestral otosclerosis was significantly lower in the area A-OW, A-IAC and around the cochlea than in controls. Based on ROC analysis, the cutoff HU value in the latter was determined to be 2,045 HU. A statistically significant correlation was found between the density of the area A-OW and the hearing level at 500 and 1,000 Hz, and between the density of the area around the cochlea and the hearing level at most frequencies. These results suggest the semi-automated diagnosis of otosclerosis may be possible.

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“…In the active phase, i.e., when spongy bone is built, foci demonstrate enhancement on T1-weighted images after the injection of contrast medium [41].…”

Section: Otosclerosismentioning

confidence: 99%

Imaging of congenital anomalies and acquired lesions of the inner ear

et al. 2007

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Imaging of the temporal bone is under continous developement. In the recent decades the technical advances of magnetic resonance imaging and computed tomography have contributed to improved imaging quality in assessment of the temporal bone. Dedicated imaging protocols have been developed and are routinely employed in most institutions. However, imaging interpretation remains challenging, since the temporal bone is an anatomically highly complex region and most diseases of the inner ear occur with low incidence, so that even radiologists experienced in the field may be confronted with such entities for the first time. The current review gives an overview about symptoms and imaging appearance of malformations and acquired lesion of the inner ear.

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Magnetic Resonance Imaging and High-Resolution Computed Tomography in the Otospongiotic Phase of Otosclerosis

Cited by 25 publications

References 7 publications

Otosclerosis: Mid-Term Results of Cochlear Implantation

Otosclerosis: Mid-Term Results of Cochlear Implantation

Relationship between CT densitometry with a slice thickness of 0.5 mm and audiometry in otosclerosis

Imaging of congenital anomalies and acquired lesions of the inner ear

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