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Morphological evaluation of the developmental change of internal auditory canal using three-dimensional computed tomography
J Korean Skull Base Soc 2024;19(2):103-108
Published online October 31, 2024
© 2024 Korean Skull Base Society.

Sunwha Song1, Beomcho Jun2

1Department of Radiology, Uijeongbu St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
2Department of Otorhinolaryngology, Uijeongbu St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
Correspondence to: Beomcho Jun
E-mail otojun@catholic.ac.kr
ORCID https://orcid.org/0000-0002-0472-5135
Received August 18, 2024; Revised September 2, 2024; Accepted September 4, 2024.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Background: This study investigated the morphological evaluation of the developmental change of internal auditory canal (IAC) using three-dimensional (3D) computed tomography (CT).
Materials and Methods: We retrospectively investigated 60 ears of 30 patients aged from birth to 19 years old. The volume of IAC was reconstructed using the Vworks 4.0 software. Data were evaluated by the age group as follows: group 1 were aged under 3 years; group 2 were aged 4–7 years; group 3 were aged 8–11 years; group 4 were aged 12–15 years; and group 5 were aged 16–19 years. Six parameters of were measured in the 3D objects with reference to the axial, coronal, and sagittal images of the CT scans as follows: (1) Wp, width of porus; (2) Wv, width of vertical posterior aperture of porus; (3) Wm, width at mid-point of IAC; (4) Dp, depth of porus; (5) Dm, depth at mid-point of IAC; and (6) Hf, height from porus to fundus.
Results: The mean volume was measured as 76.30 ± 24.24 mm3 in group 1; 104.70 ± 14.08 mm3 in group 2; 114.95 ± 41.88 mm3 in group 3; 147.68 ± 53.84 mm3 in group 4; and 188.24 ± 59.60 mm3 in group 5. The volume of IAC between the group 1 and group 2 was significantly increased (P = 0.003). IAC volume was significantly correlated with six parameters (P = 0.001).
Conclusions: Understanding the normal growth pattern of IAC could be helpful in identifying abnormal change of IAC.
Keywords : Internal auditory canal, Temporal bone, Three-dimensional, Computed tomography

October 2024, 19 (2)
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