증례

유돌분절에서 발견된 안면신경 이분지 1례

황동조1,*, 김정수1, 문준환1, 이승은1
Dong Jo Hwang1,*, Jeong Soo Kim1, Jun Hwan Moon1, Seung Eun Lee1
Author Information & Copyright
1국립의료원 이비인후과
1Department of Otolaryngology, National Medical Center, Seoul, Korea
*교신저자: 황동조, 100-196 서울 중구 을지로 6가 18-79 국립의료원 이비인후과 전화: (02) 2260-7244· 전송: (02) 2276-0534 E-mail: NMCENT2@netsgo.com

© Copyright 2000 The Busan, Ulsan, Gyeoungnam Branch of Korean Society of Otolaryngology-Head and Neck Surgery. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Received: Jan 03, 2000; Accepted: Mar 15, 2000

Published Online: May 31, 2020

ABSTRACT

Recently, we have experienced a case of bifurcation of the facial nerve in mastoid segment during the middle ear surgery by accident. The patient was a 51 year-old female who had the symptoms of hearing impairment and intermittent otorrhea in left ear for 10 years. Temporal bone computed tomograph showed suspicious findings of bifurcated facial nerve in mastoid segment. In operative findings, outer branch of the bifurcated facial nerve proceded 5 mm from distal part of the 2nd genu and then rejoined with posteromedial curved branch of that at above the stylomastoid foramen. According to the reports, variations in the anatomic course of the facial nerve in mastoid segment are very rare. The type of anatomic variation in mastoid segment can be subdivided into three categories by Procter and Nager as followings.5) The 1st type is slightly anteriorly, posteriorly curve when viewed laterally, medially or laterally curved when viewed behind. The 2nd type is a bifurcation or trif-urcation on posterior part of oval window or distal end and the 3rd type is hypoplasia of facial nerve. In order to avoid injury to the facial nerve, operator should check up the temporal bone CT findings thoroughly and keep variations of the facial nerve in mind during the middle ear surgery. (J Clinical Otolaryngol 2000;11:120–123)

Keywords: 유돌분절; 안면신경 이분지
Keywords: Facial nerve; Bifurcation