Utility of temporal bone computed tomographic measurements in the evaluation of inner ear malformations

Archives of Otolaryngology--head & Neck Surgery
Judy L ChenKay W Chang

Abstract

To investigate whether normative inner ear measurements can assist in the evaluation of sensorineural hearing loss (SNHL). Retrospective cohort review. A tertiary care hospital. Computed tomography or magnetic resonance imaging was performed on 188 ears with SNHL and 220 ears without SNHL (204 children) between 2001 and 2004. Two readers measured the basal turn of cochlea (BTC) lumen, lateral semicircular canal (LSCC) bony island width, superior semicircular canal (SSCC) bony island width, and cochlear height (CH). A t test was performed comparing measurements in patients with and without SNHL. Interobserver variability was characterized by intraclass correlation coefficients and Bland-Altman plots. The t test results demonstrated no statistically significant differences between inner ear measurements in those with and without SNHL. The intraclass correlation coefficients for BTC lumen, CH, LSCC bony island width, and SSCC bony island width measurements was 0.612, 0.632, 0.869, and 0.912, respectively. Bland-Altman plots revealed systematic biases of 1%, 8%, 10%, and 21% for the BTC lumen, SSCC bony island width, LSCC bony island width, and CH measurements, respectively. Inner ear measurements in children with and without SNHL ...Continue Reading

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