Leal P R L, Froment J-C, Sindou M
Service de neurochirurgie A, hôpital neurologique Pierre-Wertheimer, groupement hospitalier-Est, 69003 Lyon, France.
Neurochirurgie. 2009 Apr;55(2):174-80. doi: 10.1016/j.neuchi.2009.01.007. Epub 2009 Mar 18.
MRI detects vascular compression of the cranial nerve in the majority of the cases. High-resolution 3D-T1 and 3D-T2 MRI gives detailed images, particularly the 3D-T2 MRI sequences, with good contrast between cerebrospinal fluid and vascular and nerve structures. TOF-AMR (native sequence and vertebrobasilar reconstruction) shows the vascular structures in hypersignal and therefore differentiates the vessels from the cranial nerves. The 3D-T1 sequence with gadolinium reinforces the signal of the venous structures. Thus, preoperative MRI makes it possible to predict the existence of a vascular compression. The correlation study between imaging data and intraoperaitive anatomical findings showed a sensitivity of MRI of 97% and a specificity of 100%. In addition, it can specify the type and the degree of the compression. This information may help in selecting the most appropriate surgical method.
在大多数病例中，磁共振成像（MRI）可检测到颅神经的血管压迫。高分辨率三维T1加权和三维T2加权MRI能提供详细图像，尤其是三维T2加权MRI序列，脑脊液与血管及神经结构之间具有良好对比。时间飞跃法磁共振血管造影（TOF-AMR，原始序列和椎基底动脉重建）显示血管结构呈高信号，从而将血管与颅神经区分开来。注射钆剂后的三维T1序列可增强静脉结构的信号。因此，术前MRI能够预测血管压迫的存在。影像学数据与术中解剖结果的相关性研究显示，MRI的敏感性为97%，特异性为100%。此外，它还能明确压迫的类型和程度。这些信息有助于选择最合适的手术方法。
