Takahashi N, Okamoto K, Ohkubo M, Kawana M
Department of Radiology, Niigata University Faculty of Medicine, Niigata, Japan.
Clin Radiol. 2005 Mar;60(3):349-54. doi: 10.1016/j.crad.2004.06.018.
To investigate the usefulness of high-resolution MR imaging in the evaluation of the extracranial facial nerve, compared with surgical findings.
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.
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.
High-resolution MR imaging depicts the extracranial facial nerve and the parotid duct, and is useful for preoperative evaluation of parotid gland tumours.
与手术结果相比较，研究高分辨率磁共振成像在评估颅外面神经方面的实用性。
对13例腮腺良性肿瘤患者采用1.5-T磁共振系统及3英寸圆形表面线圈进行研究。在轴位平面上获取高分辨率T1加权自旋回波、T2加权快速自旋回波及三维稳态梯度回聚（GRASS）图像。生成斜位重组图像。在这些图像上识别肿瘤、腮腺导管及面神经。手术中确认肿瘤与面神经的关系。
在所有脉冲序列上，面神经均表现为低信号的线性结构。在GRASS图像中，面神经主干、颈面支及颞面支的显示率分别为100%、84.1%和53.8%。腮腺导管在T1加权图像（66.6%）及GRASS图像（81.8%）上表现为低信号结构，在T2加权图像上表现为高信号结构（91.7%）。12例患者中有11例（91.7%）肿瘤与面神经之间关系的诊断正确。
高分辨率磁共振成像能够显示颅外面神经及腮腺导管，有助于腮腺肿瘤的术前评估。
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