眶内占位性病变的MRI诊断价值

Evaluatlon of MR Imaging in the Diagnoses of Space-Occupying Lesions in t he Orhit

笔者分析了４０例眶内占位性病变的ＭＲＩ表现并与ＣＴ比较。结果表明ＭＲＩ对眶内占位性病变发现率极高，特别是对视神经的管内段和颅内蔓延或眶外软组织浸润范围的确定较ＣＴ更准确，其多方位扫描功能使定位诊断符合率高达１００％，特别是冠状面对定位诊断的作用极大。据不同组织有不同的ＭＲＩ信号强度变化的特点，结合形态学变化，ＭＲＩ对一些病变可作出定性诊断。

Magnetic resonance imaging(MRI)of forty cases with verified space-occupying le- sions in the orbit was analysed and compared with computed tomography(CT).MRI was superior to CT in the detection of intra-orbital lesions,especially in defining the extent of lesions of the intra- canalicular segment of optic nerve and intracranial or extra-orbital extensions. With multi-planar capa- bility,especially coronal section, MRI was able to detect all the orbital lesions. Based on the specific sig- nal intensity of tissues combined with morphologic changes,it was possible to make specific diagnoses in some cases by MRI.