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    Cochlear nerve - Labyrinthine dysplasia in a child with congenital sensorineural hearing loss
    (Elsevier BV, 2004) Kendi, Tuba Karagülle; Ağildere, Muhteşem; Erdal, H.Hüseyin
    Sensorineural hearing loss (SNHL) can be caused by dysfunction of cochlea, the vestibulocochlear nerve or central auditory pathways. Imaging of the temporal bone and the inner ear of patients with SNHL has become an important part of evaluation for the presence of developmental anomalies of the inner ear. In this case, we presented a 14-year-old male patient with SNHL total at left side and 50% at right side. Computed tomography (CT) and magnetic resonance imaging (MRI) revealed left sided cochlear dysplasia/hypoplasia with lateral semicircular canal-utriculosaccular cavity. T2-weighted oblique sagittal MR images demonstrated absence of cochlear nerve at the left site. Patient also has a history of meningitis. © 2003 Elsevier Ireland Ltd. All rights reserved.
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    Magnetic resonance imaging of cochlear modiolus: determination of mid-modiolar area and modiolar volume
    (Headley Brothers Ltd, 2004) Kendi, Tuba Karagülle; Arıkan, Osman Kürşat
    Modiolar deficiency has been reported as representing the mildest form of cochlear dysplasia. In this study the authors aimed to determine baseline values of the mid-modiolar area and modiolus volume in normal subjects. In this way they aimed to improve the detection of previously underdiagnosed subtle cochlear dysplasia in patients with sensorineural hearing loss.
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    Volume of components of labyrinth: Magnetic resonance imaging study
    (Lippincott Williams & Wilkins, 2005) Kendi, Tuba Karagülle; Arıkan, Osman Kürşat; Koç, Can
    Objective: To determine total inner ear fluid volume and cochlear and semicircular canal/vestibule volumes of a normal population to form a base for dimensional abnormalities of inner ear structures. Study Design: Cross-sectional. Setting: Academic otology and radiology practices. Patients: Twenty-nine healthy volunteers (13 male patients and 16 female patients with an average age of 31 yr) without any known history of intrauterine infection or any exposure to ototoxic agents and no abnormality at physical examination from the standpoint of hearing loss were included. Interventions: Twenty-nine volunteers underwent magnetic resonance imaging of the temporal region by means of thin-section T2-weighted sequences. The images were evaluated by the radiologist for the presence of any gross configurational abnormality. Fluid volume of each inner ear and components of labyrinth (cochlea, semicircular canals/vestibule) were calculated with the help of an online work station. Main Outcome Measure: To determine the volume of components of the labyrinth and total inner ear fluid, which may form a base for future studies about sensorineural hearing loss. Results: The volumes of total inner ear fluid, cochlea, and semicircular canals/vestibule were calculated. The mean and standard deviation of total inner ear fluid volume, cochlear volume, and semicircular canal/vestibule volume were obtained for each volunteer. Results were assessed with the help of statistical tests. Conclusion: There was no statistically significant difference between right and left inner ear fluid volumes of male and female subjects. There was also no statistical difference between right and left inner ear volumes when age and sex were not concerned. During evaluation of volumes according to sex, the difference between right and left inner ear fluid volumes was also assessed. Left semicircular canal/vestibule volume of female subjects were found to be higher than that of male subjects. The difference between right and left semicircular canal/vestibule volumes of female subjects was higher than the difference between right and left semicircular canal/vestibule volumes of male subjects.