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Prevalence and characteristics of vagus nerve variations on neck ultrasonography

Ultrasonography 2022년 41권 1호 p.124 ~ 130
안동빈, 이길준, 손진호, 김정규,
소속 상세정보
안동빈 ( Ahn Dong-Bin ) - Kyungpook National University School of Medicine Department of Otolaryngology-Head and Neck Surgery
이길준 ( Lee Gil-Joon ) - Kyungpook National University School of Medicine Department of Otolaryngology-Head and Neck Surgery
손진호 ( Sohn Jin-Ho ) - Kyungpook National University School of Medicine Department of Otolaryngology-Head and Neck Surgery
김정규 ( Kim Jeong-Kyu ) - Catholic University of Daegu School of Medicine Department of Otolaryngology-Head and Neck Surgery

Abstract


Purpose: We aimed to evaluate the true prevalence and characteristics of vagus nerve (VN) variations using the carotid artery (CA) and the internal jugular vein (C-I axis).

Methods: We examined patients who underwent neck ultrasonography (US) conducted by a single operator. A VN variation was defined as a VN located anterior or medial to the C-I axis. The subtypes of VN variation were classified as anterolateral, anteromiddle, anteromedial, and medial based on the relative location of the VN to the CA. The primary outcome parameters were the prevalence of VN variations and differences according to side, age, and sex.

Results: Out of 536 patients, right and left VN variations were identified in 20 (3.7%) and 186 (34.7%), respectively (P<0.001). The anteromiddle type was the commonest type observed on both sides. Eight right (1.5%) and 50 left VNs (9.3%) were located <2 mm from the lateral border of the ipsilateral thyroid gland (P<0.001). The prevalence of VN variations in male and female patients was 42.1% and 32.7%, respectively (P=0.029), and that in patients aged <20, 20-39, 40-59, and ≥60 years was 23.8%, 22.5%, 34.4%, and 47.4%, respectively (P<0.001).

Conclusion: Variations in the VN position were relatively common on US. The variations primarily involved the left VN in the lower cervical region, and an increasing prevalence with age was observed.

키워드

Neck; Vagus nerve; Variation; Ultrasonography; Prevalence

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