Contrast enhancement of the facial nerve on MRI: Normal or pathological?
Contrast enhancement of the facial nerve on MRI: Normal or pathological?
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DOI：
10.1007/s002340050395
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发表时间：
1997-03-01
期刊：
影响因子：
2.8
通讯作者：
Chiras, J
中科院分区：
文献类型：
--
作者：
MartinDuverneuil, N;SolaMartinez, MT;Chiras, J
我们前瞻性地分析了面神经的正常对比增强MRI特征，并确定了病理性对比增强的标准。我们研究了31例临床正常的面神经患者，在使用造影剂前后进行了T1加权成像。评估每个节段的强化强度、厚度和左右对称性，并与异常面神经的MRI特征进行相关性分析。在98%的病例中，至少有一段面神经出现强化，但仅在面神经管内：小脑节：78.2%;膝状神经节：96.9%;鼓室：88.4%;乳突：66.6%。17.4%的脊髓段、36.3%的膝状神经节、25.6%的鼓室段和7.1%的乳突段出现明显（++）到强烈（+）强化，而强烈强化仅见于膝状神经节（6%）和鼓室段（11.6%）。在69%的病例中观察到左右不对称。强化程度与神经厚度无相关性。第八条神经未见强化。我们建议三个标准的病理增强：面神经管外的增强;增强的延伸到第八神经;和强烈的增强，在小脑和/或乳突段。
We prospectively analysed the normal contrast-enhanced MRI features of the facial nerve and determined criteria for pathological contrast enhancement. We studied 31 patients with clinically normal facial nerves with T1-weighted images before and after contrast medium. The intensity, thickness and right-left symmetry of enhancement were assessed in each segment and correlated with MRI features observed in abnormal facial nerves. Enhancement along at least one segment of the facial nerve was seen in 98 % of cases, but only within the facial canal: labyrinthine segment: 78.2 %; geniculate ganglion: 96.9 %; tympanic: 88.4 %; mastoid: 66.6 %. Marked (++) to intense (+++) enhancement was seen in the labyrinthine segment in 17.4 %, the geniculate ganglion in 36.3 %, and the tympanic (25.6 %) and mastoid (7.1 %) segments, whereas intense enhancement was only seen in the geniculate ganglion (6 %) and the tympanic segment (11.6 %). A right-left asymmetry was noted in 69 % of cases. No correlation was found between enhancement and the thickness of the nerve. No enhancement of the eighth nerve was seen. We suggest three criteria for pathological enhancement: enhancement outside the facial canal; extension of enhancement to the eighth nerve; and intense enhancement in the labyrinthine and/or mastoid segments.