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Purpose <p>To demonstrate 3D volumetric computed tomography (CT) analysis of the internal auditory canal (IAC) in a large pediatric population and to evaluate the relationship between age, sex, and IAC mid-point diameters.</p> Methods <p>The study population comprised children between 0 and 16&#xa0;years of age who underwent temporal bone CT. Five males and five females were included in each age group. The IAC mid-point diameters were measured, and a three-dimensional volumetric reconstruction analysis was made. The receiver operating characteristic (ROC) analysis was performed to detect thresholds for the IAC volumes.</p> Results <p>A total of 340 ears were evaluated. IAC volume increases with age, most significantly from ages 0–4 to &gt; 4&#xa0;years. A moderate and significant monotonic increase in IAC volume with age for both the left and right sides were found (<i>r</i> = 0.37, <i>p</i> &lt; 0.001). A ROC analysis revealed that the optimal threshold for the mean IAC volume was 147&#xa0;mm<sup>3</sup>. IAC volumes above this threshold indicated a child aged over four years, with an area under the curve (AUC) of 0.76. This threshold yielded a sensitivity of 90% and a specificity of 62%. No significant differences in IAC volume were observed between the right and left sides or between sexes across all age groups.</p> Conclusion <p>The current study provides normative 3D volumetric benchmarks for pediatric IAC development, underscoring its accelerated growth in early childhood and supporting anatomical precision in radiological assessment and otologic surgery.</p>

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Pediatric internal auditory canal volume: age-related changes and sex differences in a cohort of 340 ears

  • 期刊论文

  • 发表日期：

    2025年11月20日

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  • Elif Dilara Topcuoglu,
  • Sevde Nur Emir

摘要

Purpose

To demonstrate 3D volumetric computed tomography (CT) analysis of the internal auditory canal (IAC) in a large pediatric population and to evaluate the relationship between age, sex, and IAC mid-point diameters.

Methods

The study population comprised children between 0 and 16 years of age who underwent temporal bone CT. Five males and five females were included in each age group. The IAC mid-point diameters were measured, and a three-dimensional volumetric reconstruction analysis was made. The receiver operating characteristic (ROC) analysis was performed to detect thresholds for the IAC volumes.

Results

A total of 340 ears were evaluated. IAC volume increases with age, most significantly from ages 0–4 to > 4 years. A moderate and significant monotonic increase in IAC volume with age for both the left and right sides were found (r = 0.37, p < 0.001). A ROC analysis revealed that the optimal threshold for the mean IAC volume was 147 mm3. IAC volumes above this threshold indicated a child aged over four years, with an area under the curve (AUC) of 0.76. This threshold yielded a sensitivity of 90% and a specificity of 62%. No significant differences in IAC volume were observed between the right and left sides or between sexes across all age groups.

Conclusion

The current study provides normative 3D volumetric benchmarks for pediatric IAC development, underscoring its accelerated growth in early childhood and supporting anatomical precision in radiological assessment and otologic surgery.