High-resolution magnetic resonance of the extracranial facial nerve and parotid duct: demonstration of the branches of the intraparotid facial nerve and its relation to parotid tumours by MRI with a surface coil

被引:36
作者
Takahashi, N
Okamoto, K
Ohkubo, M
Kawana, M
机构
[1] Niigata City Gen Hosp, Dept Radiol, Niigata 9508739, Japan
[2] Niigata Univ, Fac Med, Dept Radiol, Niigata, Japan
[3] Niigata Univ, Fac Med, Dept Radiotechnol, Niigata, Japan
[4] Niigata Univ, Fac Med, Dept Otorhinolaryngol, Niigata, Japan
关键词
nerves; facial; parotid duct; parotid gland; MR;
D O I
10.1016/j.crad.2004.06.018
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
AIM: To investigate the usefulness of high-resolution MR imaging in the evaluation of the extracranial. facial nerve, compared with surgical findings. MATERIALS AND METHODS: Thirteen patients with benign parotid tumours were studied on a 1.5-T MR system with a 3 in circular surface coil. High-resolution T1-weighted spin-echo, T2-weighted fast spin-echo, and three-dimensional gradient-recalled acquisition in the steady state (GRASS) images were obtained in the axial planes. Oblique reformatted images were generated. Tumours, parotid ducts and facial nerves were identified on these images. The relationship of the tumours to the facial nerves was confirmed at surgery. RESULTS: Facial nerves appeared as linear structures of low intensity on all pulse sequences. The main trunks and cervicofacial and temporofacial divisions of the facial nerves were identified in 100%, 84.1% and 53.8% of GRASS images, respectively. Parotid ducts appeared as structures of low intensity on T1-weighted (66.6%) and GRASS images (81.8%), and as structures of very high intensity on T2-weighted images (91.7%). The relationships of the tumours to the facial nerves were correctly diagnosed in 11 (91.7%) of 12 cases. CONCLUSION: High-resolution MR imaging depicts the extracranial facial nerve and the parotid duct, and is useful for preoperative evaluation of parotid gland tumours. (C) 2005 The Royal College of Radiologists. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:349 / 354
页数:6
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