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Morphological characteristics of external auditory canal in congenital aural stenosis patients |
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| Authors: | Dongming Yin Chenlong Li Keguang Chen Juan Hong Jieying Li Lin Yang Tianyu Zhang Peidong Dai |
| Affiliation: | 1. ENT institute, Eye & ENT Hospital of Fudan University, Shanghai, China;2. Hearing Medicine Key Laboratory, National Health and Family Planning Commission, Shanghai, China |
| Abstract: | ObjectiveTo investigate characteristics of congenital aural stenosis (CAS) patients' external auditory canal (EAC) (position, length, orientation, etc.) and compare them with normal EAC. MethodsCT images of normal people and CAS patient were utilized. We obtained coordinates of EAC landmarks. Then the Matlab program could calculate some anatomic parameters about EAC, including distances from central point of tympanic annulus (CA), central point of osseous EAC opening (CO), central point of cartilaginous EAC inside opening (CCi), central point of cartilaginous EAC outside opening (CCo) to the Frankfurt horizontal plane (Pfrkt), the median sagittal plane (Psag), the coronal plane (Pcor); orientations of EAC bendings; straight and arc lengths of EAC.ResultsDistances from CA, CO, CCi and CCo to Pfrkt were all shorter in CAS group than control group (p < 0.05). The straight and arc lengths of cartilaginous EAC in CAS group were shorter than control group (p < 0.05). Straight and arc lengths of EAC in CAS group were shorter than those in control group (p < 0.05). The proportion of one bending in cartilaginous EAC in control group was significantly lower than CAS group (p < 0.05). Orientations of EAC bendings in CAS group differed from those in control group (p < 0.05).ConclusionIn addition to smaller diameters, compared with normal EAC, the position of CAS patients' osseous EAC was higher compared with the normal. The majority of CAS patients have a bending and downward slanting cartilaginous EAC. Orientations of EAC bending in CAS patients were different from normal. Besides, the length of CAS patients' cartilaginous EAC was shorter. However, there were no significant differences between CAS patients and normal people in length of osseous EAC. These differences in anatomic parameters could provide the basis for optimizing the meatoplasty. |
| Keywords: | EAC external auditory canal CT computed tomography MRI magnetic resonance imaging CAS congenital aural stenosis PA tympanic annulus PO osseous EAC opening PCi cartilaginous EAC inside opening PCo cartilaginous EAC outside opening OEB-A osseous EAC bending A OEB-B osseous EAC bending B CEB-A cartilaginous EAC bending A CEB-B cartilaginous EAC bending B OEB-Ar the radius of the OEB-A OEB-Ac the curvature of the OEB-A OEB-Aa the angle of the OEB-A OEB-Al the arc length of the OEB-A Pfrkt Frankfurt horizontal plane FS foramen spinosums Psag the median sagittal plane Pcor the coronal plane CA central point of the tympanic annulus CA-Pfrkt distance from the central point of CA to the Frankfurt horizontal plane CA-Psag distance from the central point of CA to the median sagittal plane CA-Pcor distance from the central point of CA to the coronal plane CO central point of osseous EAC opening CO-Pfrkt distance from the central point of CO to the Frankfurt horizontal plane CO-Psag distance from the central point of CO to the median sagittal plane CO-Pcor distance from the central point of CO to the coronal plane CCi central point of cartilaginous EAC inside opening CCi-Pfrkt distance from the central point of CCi to the Frankfurt horizontal plane CCi-Psag distance from the central point of CCi to the median sagittal plane CCi-Pcor distance from the central point of CCi to the coronal plane CCo central point of cartilaginous EAC outside opening CCo-Pfrkt distance from the central point of CCo to the Frankfurt horizontal plane CCo-Psag distance from the central point of CCo to the median sagittal plane CCo-Pcor distance from the central point of CCo to the coronal plane ALO the arc length of osseous EAC SLO the straight length of osseous EAC ALC the straight length of osseous EAC SLC the straight length of cartilaginous EAC ALE the arc length of EAC SLE the straight length of EAC External auditory canal (EAC) Congenital aural stenosis (CAS) Computed tomography (CT) Morphometric characteristics |
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