Characteristics of Temporal Bone CT Imaging in Cases of Difficult Transmeatal Endoscopic Type I Tympanoplasty
ZHANG Lue
LU Hui
ZHANG Quanming
ZENG Nan
HU Jing
YANG Qiong
Abstract：Objective To describe characteristics of temporal bone computed tomography imaging in cases of difficult transmeatal endoscopic type I tympanoplasty.Methods Temporal bone CT image data from 43 patients with chronic otitis media admitted to the Department of Otorhinolaryngology,Huazhong University of Science and Technology Union Shenzhen Hospital,from January 2021 to November 2022 who underwent endoscopic type Ⅰtympanoplasty by the same surgeon were retrospectively reviewed.External auditory meatus morphology and measurements were described.Results In the 43 patients(ears),the ear canal was hourglass-shaped in 35 ears,cone-shaped in 5 ears,cylinder-shaped in 2 ears and ovoid in 1 ear,with a mean width diameter of 3.76±0.23(3.4-4.2)mm.Overhanging was seen in the inferior canal wall in 35 cases(81.39％),in the posterior canal wall in 31 cases(72.09％),and in the anterior canal wall in 28 cases(65.12％),with the angle of inferior canal wall overhang(127.2-159.5°,143±12.27°)less than that of the anterior(129.8-167.7°,147.76±13.89°)and posterior(131.8-166.2°,149.0±11.48°)walls(P<0.05).Conclusion The most common external auditory canal morphology in difficult endoscopic typeⅠtympanoplasty is the shape of hourglass,while inferior canal wall overhang is the most common and more prominent.Preoperative temporal bone CT evaluation and measurement of the external auditory canal can be used to guide surgery.
Keywords：transcanal endoscopictype I tympanoplastyexternal auditory canaltemporal bone CT imaging
Publication Date：2024-12-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 881-884 )