Normal variations of the temporal bone on high-resolution CT: Their incidence and clinical significance

Tomura, Noriaki; Sashi, Ryuji; Kobayashi, M.; Hirano, Hiroko; Hashimoto, Masaji; Watarai, Jiro

doi:10.1016/s0009-9260(05)83043-0

Cited by 64 publications

(45 citation statements)

References 13 publications

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“…This variation may obstruct the access to the round window during the operation [33] . In a study conducted by Tomura et al [34] in 1995, which was performed in 325 patients with the purpose of evaluating temporal bone variations, they found the high jugular bulb rate to be 2.4%. In our study, we did not evaluate high positioned jugular bulb variation as an ear anomaly; we detected it in 21 (3.5%) of 600 ears.…”

Section: Discussionmentioning

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: Discussionmentioning

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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“…Precise imaging of the cochlea, the vestibule, and the semicircular canals is essential for comparative and quantitative studies. There is a little information on the morphological variation of the osseous labyrinth in man [10,12]. Possible reasons include accessibility to the micro-CT scanner and its technical capabilities.…”

Section: Discussionmentioning

confidence: 99%

A preliminary study of three-dimensional reconstruction of the human osseous labyrinth from micro-computed tomography scans

2013

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“…Severe asymmetry in jugular bulb size, defined as greater than 20 mm difference in diameter, occurs in approximately 50% of individuals. 18 The combination of venous flow MR signal heterogeneity and differences in jugular bulb size can create a pseudolesion, which should not be mistaken for true abnormality. Concordant asymmetry of the internal jugular veins of the neck can be reassuring of normal jugular bulb asymmetry rather than a true jugular bulb lesion.…”

Section: Middle Ear and Mastoid Air Cellsmentioning

confidence: 99%

Imaging of the Temporal Bone

Abele¹,

Wiggins²

2015

Radiologic Clinics of North America

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A variety of congenital, infectious, inflammatory, vascular, and benign and malignant neoplastic pathology affects the temporal bone. Knowledge of normal temporal bone anatomy and space-specific differential diagnoses is key to imaging interpretation of temporal bone. Correlation with clinical history and physical examination is vital to making the correct diagnosis or providing an appropriate differential. Computed tomography and magnetic resonance imaging are complementary imaging modalities in the evaluation of temporal bone abnormalities.

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Normal variations of the temporal bone on high-resolution CT: Their incidence and clinical significance

Cited by 64 publications

References 13 publications

Radiological Imaging Findings of Patients with Congenital Totally Hearing Loss

Radiological Imaging Findings of Patients with Congenital Totally Hearing Loss

A preliminary study of three-dimensional reconstruction of the human osseous labyrinth from micro-computed tomography scans

Imaging of the Temporal Bone

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