Góngora-Cadena G, Corvera-Behar LG, García-De la Cruz MA, Montero-Márquez MÁ, Jiménez-Gutiérrez C

Language: Spanish
References: 0
Page: 169-175
PDF size: 242.90 Kb.

ABSTRACT

Background: Sensorineural hearing loss (SNHL) is one of the leading causes of disability in children worldwide. Computed tomography (CT) of temporal bone allows an excellent visual identification of obvious and severe defects; however, these malformations only represent 1% of the anomalies found radiographically.
Objetive: To describe the subtle tomographic characteristics of the inner ear in Mexican population with profound and/or severe sensorineural hearing loss. To compare between measurement values established in North American and European population.
Material and Method: An observational, descriptive and cross-sectional study that included Mexican patients, both genders, all ages, with bilateral profound and/or severe sensorineural hearing loss with high-resolution temporal bone CT protocol. Statistical analysis was made using t-Student test.
Results: 200 ears were evaluated, 18 presented malformations detected by visual inspection. Using the measuring tool on a workstation of the imaging department, hypoplasia was found in 34 ears (17%), cochlear nerve hypoplastic bone channel in 39 ears (19.5%), narrow internal auditory meatus in 33 ears (16.5%), lateral semicircular canal hypoplastic bone island in 7 (3.5%) and large vestibular aqueduct in 2 ears (1%).
Conclusion: The result of the ten measurements made in the inner ear is comparable to the one established in global population. The percentage of defects detected by visual inspection is below that obtained by formal measurements, so we recommend that imaging departments routinely measure and report the height of the cochlea, the diameter of the bony island of the lateral semicircular canal, and the width of the modiolar aperture.