CT of the Normal Temporal Bone: Comparison of Multi– and Single–Detector Row CT

Jäger, L.; Bonél, Harald; Liebl, Martin; Srivastav, Sudesh; Arbusow, Viktor; Hempel, Martin; Reiser, Maximilian

doi:10.1148/radiol.2351020895

Cited by 48 publications

(34 citation statements)

References 16 publications

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“…To display the bone labyrinth and internal auditory canal (IAC), the high resolution temporal bone CT technique is the first priority. Temporal bone CT provides detailed information about the condition of the otic capsule, cochlea, vestibule, oval and round window, and semicircular canals as well as the course of the facial nerve, IAC, vestibular aquaduct (VA), and cochlear aqueduct (CA) [7] .…”

Section: Introductionmentioning

confidence: 99%

Radiological Imaging Findings of Patients with Congenital Totally Hearing Loss

Dagkiran

Dağkıran²,

Sürmelioğlu³

et al. 2016

Int Adv Otol

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OBJECTIVE:The aim of this study was to determine and classify inner ear abnormalities in patients who had cochlear implants because of congenital sensorineural hearing loss using preoperative temporal bone computed tomography and magnetic resonance imaging. MATERIALS and METHODS:Patients in the otolaryngology department who had cochlear implants because of congenital sensorineural hearing loss between January 2011 and December 2013 were included in the study. There were 167 male and 133 female patients, a total of 300. All of the patients were evaluated with 4-detector-row computed tomography and 1.5 Tesla magnetic resonance imaging. RESULTS:Inner ear abnormalities were found in 136 of 600 ears (20.3%). There were six ears with incomplete partition-II (4.4%), five ears with incomplete partition-I (3.6%), two ears with Michel deformity (1.4%), two ears with cochlear hypoplasia (1.4%), two ears with cochlear otosclerosis (1.4%), and one ear with common cavity deformity (0.7%). Dilatation of the internal acoustic canal was found in 42 ears (30.9%); also, 21 ears with cochlear nerve aplasia/hypoplasia (15.4%), 5 ears with internal acoustic canal aplasia, and 1 ear with internal acoustic canal hypoplasia (0.73%) were detected. There were 10 ears with posterior semicircular canal (7.3%), 10 ears with lateral semicircular canal (7.4%), 8 ears with superior semicircular canal aplasia/hypoplasia (5.9%), and 8 ears with lateral semicircular canal-vestibular dysplasia. An enlarged vestibular aqueduct was found in 16 ears (11.7%). High jugular bulbs were found in 21 ears; however, this variation was not considered to be an inner ear abnormality. CONCLUSION:Computed tomography and magnetic resonance imaging are essential for the evaluation, determination, and classification of inner ear abnormalities in patients with congenital sensorineural hearing loss who are candidates for cochlear implant operations. Also, these radiological instruments aid in determining contraindications and predicting intraoperative difficulties. Computed tomography and magnetic resonance imaging findings for these patients should be evaluated by an experienced radiologist before the operation.

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Section: Introductionmentioning

confidence: 99%

Radiological Imaging Findings of Patients with Congenital Totally Hearing Loss

Dagkiran

Dağkıran²,

Sürmelioğlu³

et al. 2016

Int Adv Otol

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“…The complete absence of the osseous wall of the facial nerve canal is usually located in the region around the oval window, in the medial 2/3 of the tympanic segment. In the study of Jäger et al [9] dehiscence was 60%. According to Kim et al [13] the incidence of dehiscence of the facial nerve canal varies from 0.5% do 74%.…”

Section: Discussionmentioning

confidence: 90%

The Incidence of Dehiscence of the Tympanic Segment of the Facial Nerve Canal Estimated With Computed Tomography

Bulja¹,

Stojanov²,

Ignjatović³

et al. 2016

RAD Conference Proceedings

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Abstract. In this study, we aimed to determine the presence and incidence of dehiscence of the tympanic segment of the facial nerve canal using the High Resolution Computed Tomography (HRCT) and to evaluate this variation in relation to gender and age. The retrospective-prospective study was performed at the Clinic for Radiology, University Clinical Center of Sarajevo. After the criteria for participation and non-participation in the study were applied, the study included 295 patients (160 women and 135 men) of ages ranging from 5 to 75, with performed computed tomography (CT) of the temporal bone as a part of a standard procedure due to the suspicion of pathological activity in that area. We divided the subjects into seven age groups. Each group included a ten-year period. The presence of dehiscence of the facial nerve canal was recorded and the obtained results were statistically analyzed. Of the total number of patients included in the study, the dehiscence of the tympanic segment of the facial nerve canal was found in 95 patients (32%). Of 590 temporal bones, there were 118 temporal bones with facial nerve canal dehiscence in the tympanic segment (20%). The dehiscence without stenosis of the oval window was noted in 110 temporal bones (18.6%). The dehiscence with stenosis of the oval window was noted in 8 temporal bones (1.4%). There was no statistically significant difference between age groups (p=0.245, Pearson's χ2 test). Also, there was no statistically significant difference between males and females (p=0.385, Pearson's χ2 test). The incidence of dehiscence of the facial nerve canal is high and the tympanic segment is the most frequent site of dehiscence localization. Almost one third of the patients with the suspicion of pathological processes on the temporal bone can have dehiscence of the tympanic segment of the facial nerve canal. HRCT is the best visual imaging technique for the evaluation of the facial nerve course within its osseous canal.

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“…Obtaining these sections simultaneously increases both the radiation dose received by the patient and the duration of the examination. [3,[18][19][20][21] In addition, many patients cannot maintain the position in which the head is brought to backward flexion in the prone position, which is required to obtain coronal images. [1,3,5] Since the dental region is within the field, there will be artefacts in the direct coronal sections of patients with a dental apparatus.…”

Section: Ent Updatesmentioning

confidence: 99%