Service de neuroradiologie, hôpital Gui de Chauliac, 80, avenue Augustin-Fliche, 34295 Montpellier cedex 5, France.
Diagn Interv Imaging. 2013 Oct;94(10):973-84. doi: 10.1016/j.diii.2013.06.001. Epub 2013 Jul 4.
Damage to the optic nerve (ON) is characterised by a reduction in visual acuity. Pre-chiasmatic lesions to the optic nerve may be of traumatic, congenital, tumoral (meningioma, glioma), inflammatory or vascular origins. In all cases, MRI is the choice means of exploration, carried out with axial and coronal sections with a thickness of 2.5-3mm and T1 and T2-weighted spin echo sequences. The coronal sections may be carried out with fat signal saturation for an elective study of the size of the retrobulbar portion of the ON.
视神经损伤的特征是视力下降。视神经管内病变可由创伤、先天、肿瘤（脑膜瘤、神经胶质瘤）、炎症或血管病变引起。在所有情况下，MRI 都是首选的检查方法，进行轴位和冠状位扫描，层厚 2.5-3mm，T1 和 T2 加权自旋回波序列。冠状位扫描可采用脂肪信号抑制，选择性研究视神经眶内段的大小。
