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External Auditory Canal: Computed Tomography Analysis and Classification
Mohammad Waheed El-Anwar1, Yasser Ahmed Fouad1, Ahmed Fouad Elgohary1
1Department of Otorhinolaryngology-Head and Neck Surgery, Faculty of Medicine, Zagazig University, Zagazig, Egypt.
International Archives of Otorhinolaryngology
|October 25, 2023
Summary
This study provides crucial computed tomography (CT) measurements for the external auditory canal (EAC), detailing its dimensions and variations. Findings reveal significant differences in EAC size between males and females, aiding otologists and radiologists.
Area of Science:
- Otolaryngology
- Radiology
- Anatomy
Background:
- Computed tomography (CT) details of the external auditory canal (EAC) are not fully documented in existing literature.
- Preoperative assessment of the EAC is essential for surgical planning and procedures involving the ear canal.
Purpose of the Study:
- To establish comprehensive CT-based measurements and grading of the external auditory canal.
- To identify and quantify variations in EAC dimensions not previously published.
Main Methods:
- Analysis of CT scans from 100 temporal bones (200 sides).
- Utilized multiplanar reformatted images (coronal and sagittal) from axial scans for detailed EAC evaluation.
- Measured vertical and horizontal dimensions at EAC entry, bony-cartilaginous junction, isthmus, and medial end.
Main Results:
- Established mean dimensions for the EAC at various points, with no significant side-to-side differences.
- Identified statistically significant differences in EAC dimensions between males and females.
- Males exhibited larger vertical and horizontal dimensions at the EAC entry, isthmus, and medial end compared to females.
Conclusions:
- This research enhances the understanding of external auditory canal anatomical variations among different genders.
- Provides valuable reference data for otologists and radiologists, particularly for training and preoperative planning.
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