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KMID : 0361020150580120848
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Korean Journal of Otolaryngology - Head and Neck Surgery
2015 Volume.58 No. 12 p.848 ~ p.854
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Anatomical Relationships between Eustachian Tube and Internal Carotid Artery Using Computed Tomography
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정재훈:Jung Jae-Hoon
고의경:Goh Eui-Kyung/이일우:Lee Il-Woo/정재환:Jung Jae-Hwan/오세준:Oh Se-Joon/공수근:Kong Soo-Keun
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Abstract
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Background and Objectives: It is important to figure out the location between the internal carotid artery (ICA) and the Eustachian tube (ET) for conducting safe ET surgery. Using computed tomography (CT), this study was aimed to evaluate the anatomical relationship between ET and ICA according to age and gender.
Subjects and Method: Contrast enhanced CT scans of the paranasal sinus taken between January 2005 and December 2010 were reviewed retrospectively. A total of 216 patients (432 ears) were enrolled. In each patient, we measuresed the distance from the anterior cushion of torus tubarius to ICA (AC-ICA), the distance from the posterior cushion of torus tubarius to ICA (PC-ICA), the distance from the Rosenmuller fossa to ICA, the shortest distance from ET lumen to ICA (ET-ICA), and the angle between the imaginary lines from the orifice of ET to the posterior end point of nasal septum to point ICA (∠ET-NS-ICA). Patients were divided into 10 groups based on age difference of 15-years.
Results: For the female patients aged 65 to 80 years old, AC-ICA, PC-ICA were closest from the nasopharynx. For this group, at p<0.05, the distances of AC-ICA, PC-ICA and ET-ICA showed a negative correlation with increasing age, whereas∠ET-NS-ICA (p<0.05) showed a positive correlation, indicating a tendency of medicalization with increased age.
Conclusion: The distance between ET and ICA represents a variety of distribution according to gender and age. When performing a surgery for the nasopharyngeal portion of ET, the surgeon should be aware of the location of ICA in the preoperative CT findings.
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KEYWORD
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Computed tomography, Eustachian tube, Internal carotid artery
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