Computertomographie des Felsenbeines, Mit Magnetresonanztomographie[Computed tomography of the temporal bone, with magnetic resonance imaging]

AbstractObjectives:The bony cochlear nerve canal is the space between the fundus of the internal auditory canal and the base of the cochlear modiolus that carries cochlear nerve fibres. This study aimed to determine the distribution of bony labyrinth anomalies and cochlear nerve anomalies in patients with bony cochlear nerve canal and internal auditory canal atresia and stenosis, and then to compare the diameter of the bony cochlear nerve canal and internal auditory canal with cochlear nerve status.Methods:The study included 38 sensorineural hearing loss patients (59 ears) in whom the bony cochlear nerve canal diameter at the mid-modiolus was 1.5 mm or less. Atretic and stenotic bony cochlear nerve canals were examined separately, and internal auditory canals with a mid-point diameter of less than 2 mm were considered stenotic. Temporal bone computed tomography and magnetic resonance imaging scans were reviewed to determine cochlear nerve status.Results:Cochlear hypoplasia was noted in 44 out of 59 ears (75 per cent) with a bony cochlear nerve canal diameter at the mid-modiolus of 1.5 mm or less. Approximately 33 per cent of ears with bony cochlear nerve canal stenosis also had a stenotic internal auditory canal and 84 per cent had a hypoplastic or aplastic cochlear nerve. All patients with bony cochlear nerve canal atresia had cochlear nerve deficiency. The cochlear nerve was hypoplastic or aplastic when the diameter of the bony cochlear nerve canal was less than 1.5 mm and the diameter of the internal auditory canal was less than 2 mm.Conclusion:The cochlear nerve may be aplastic or hypoplastic even if temporal bone computed tomography findings indicate a normal cochlea. If possible, patients scheduled to receive a cochlear implant should undergo both computed tomography and magnetic resonance imaging of the temporal bone. The bony cochlear nerve canal and internal auditory canal are complementary structures, and both should be assessed to determine cochlear nerve status.

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Giant cell reparative granuloma of the temporal bone successfully resected with preservation of hearing

The Journal of Laryngology & Otology ◽

10.1017/s002221511300114x ◽

2013 ◽

Vol 127 (7) ◽

pp. 716-720 ◽

Cited By ~ 2

Author(s):

Y Takata ◽

H Hidaka ◽

K Ishida ◽

T Kobayashi

Keyword(s):

Magnetic Resonance Imaging ◽

Computed Tomography ◽

Magnetic Resonance ◽

Giant Cell ◽

Temporal Bone ◽

Hearing Preservation ◽

Resonance Imaging ◽

Giant Cell Reparative Granuloma ◽

Total Resection ◽

History Of

AbstractObjective:To describe a case of giant cell reparative granuloma of the temporal bone which extended into the middle-ear cavity, and which was successfully treated surgically via a transmastoid approach, with hearing preservation.Case:A 37-year-old man presented with a one-year history of right-sided hearing loss, complicated by a three-month history of otalgia and a sensation of aural fullness. Computed tomography and magnetic resonance imaging demonstrated an osteolytic tumour lesion in the right temporal bone. The diagnosis was confirmed by biopsy from the mastoid lesion.Investigation and intervention:Pure-tone audiometry, computed tomography and magnetic resonance imaging were conducted, followed by total resection.Result:The giant cell reparative granuloma of the temporal bone was completely resected, with preservation of hearing.Conclusion:Although this patient's giant cell reparative granuloma of the temporal bone extended into the middle-ear cavity, total resection was achieved, with preservation of hearing. To the best of our knowledge, hearing preservation following resection of giant cell reparative granuloma of the temporal bone has not previously been reported.

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Magnetic Resonance Imaging versus Computed Tomography in Temporal Bone Carcinoma: Radiological and Pathological Correlation

Otolaryngology ◽

10.1177/0194599814541629a248 ◽

2014 ◽

Vol 151 (1_suppl) ◽

pp. P215-P216

Author(s):

Samuel A. Spear ◽

Rahul Mehta ◽

Neal Jackson ◽

Yu-Lan Mary Ying ◽

Daniel W. Nuss ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Computed Tomography ◽

Magnetic Resonance ◽

Temporal Bone ◽

Resonance Imaging ◽

Pathological Correlation

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Radiological findings in spontaneous cerebrospinal fluid leaks of the temporal bone

The Journal of Laryngology & Otology ◽

10.1017/s0022215121001171 ◽

2021 ◽

pp. 1-7

Author(s):

T Hendriks ◽

A Thompson ◽

R Boeddinghaus ◽

H E I Tan ◽

J Kuthubutheen

Keyword(s):

Magnetic Resonance Imaging ◽

Computed Tomography ◽

Cerebrospinal Fluid ◽

Magnetic Resonance ◽

Temporal Bone ◽

Cerebrospinal Fluid Leak ◽

Resonance Imaging ◽

Cerebrospinal Fluid Leaks ◽

Temporal Bones ◽

Fluid Leak

Abstract Background and objective Spontaneous cerebrospinal fluid leak of the temporal bone is an emerging clinical entity for which prompt and accurate diagnosis is difficult given the subtle signs and symptoms that patients present with. This study sought to describe the key temporal bone abnormalities in patients with spontaneous cerebrospinal fluid leak. Methods A retrospective cohort study was conducted of adult patients with biochemically confirmed spontaneous cerebrospinal fluid leak. Demographics and radiological features identified on computed tomography imaging of the temporal bones and/or magnetic resonance imaging were analysed. Results Sixty-one patients with spontaneous cerebrospinal fluid leak were identified. Fifty-four patients (88.5 per cent) underwent both temporal bone computed tomography and magnetic resonance imaging. Despite imaging revealing bilateral defects in over 75 per cent of the cohort, only two patients presented with bilateral spontaneous cerebrospinal fluid leaks. Anterior tegmen mastoideum defects were most common, with an average size of 2.5 mm (range, 1–10 mm). Conclusion Temporal bone computed tomography is sensitive for the identification of defects when suspicion exists. In the setting of an opacified middle ear and/or mastoid, close examination of the skull base is crucial given that this fluid is potentially cerebrospinal fluid.

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Role of computed tomography and magnetic resonance imaging in the assessment of temporal bone pre-cochlear and postcochlear implantation

The Scientific Journal of Al-Azhar Medical Faculty Girls ◽

10.4103/sjamf.sjamf_29_19 ◽

2019 ◽

Vol 3 (2) ◽

pp. 517

Author(s):

MohamedS Elfeshawy ◽

TarekM El-Zayat ◽

AhmedH Khashaba ◽

MohamedE.Abd El-Raouf

Keyword(s):

Magnetic Resonance Imaging ◽

Computed Tomography ◽

Magnetic Resonance ◽

Temporal Bone ◽

Resonance Imaging

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Computed tomography versus magnetic resonance imaging in paediatric cochlear implant assessment: a pilot study and our experience at Great Ormond Street Hospital

The Journal of Laryngology & Otology ◽

10.1017/s0022215118000440 ◽

2018 ◽

Vol 132 (06) ◽

pp. 529-533 ◽

Cited By ~ 1

Author(s):

H Kanona ◽

K Stephenson ◽

F D'Arco ◽

K Rajput ◽

L Cochrane ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Computed Tomography ◽

Magnetic Resonance ◽

Cochlear Implant ◽

Temporal Bone ◽

Magnetic Resonance Imaging Scan ◽

Resonance Imaging ◽

High Resolution Computed Tomography ◽

Street Hospital ◽

Operative Assessment

AbstractBackgroundTo date, there is a lack of consensus regarding the use of both computed tomography and magnetic resonance imaging in the pre-operative assessment of cochlear implant candidates.MethodsTwenty-five patients underwent high-resolution computed tomography and magnetic resonance imaging. ‘Control scores’ describing the expected visualisation of specific features by computed tomography and magnetic resonance imaging were established. An independent radiological review of all computed tomography and magnetic resonance imaging scan features was then compared to the control scores and the findings recorded.ResultsAgreement with control scores occurred in 83 per cent (20 out of 24) of computed tomography scans and 91 per cent (21 out of 23) of magnetic resonance imaging scans. Radiological abnormalities were demonstrated in 16 per cent of brain scans and 18 per cent of temporal bone investigations.ConclusionAssessment in the paediatric setting constitutes a special situation given the likelihood of congenital temporal bone abnormalities and associated co-morbidities that may be relevant to surgery and prognosis following cochlear implantation. Both computed tomography and magnetic resonance imaging contribute valuable information and remain necessary in paediatric cochlear implant pre-operative assessment.

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