视神经肿瘤的MRI诊断

目的:探讨视神经肿瘤的MRI表现。方法:回顾了18例经MRI检查并经临床病理确诊的视神经肿瘤的病例。结果:视神经脑膜瘤8例,表现为视神经增粗1例,梭形肿块5例,软组织肿块2例。MR T1WI呈等或稍低信号,T2WI呈高信号。视神经胶质瘤6例,表现为视神经梭形增粗2例,椭圆形肿块4例,MR T1WI呈等信号,T2WI呈高信号。视神经转移瘤4例,3例为视网膜母细胞瘤累及视神经,MRI表现为眼球内病变侵犯视神经和视交叉,T1WI呈稍低信号,T2WI呈稍高信号;1例为乳腺癌转移至视神经,MRI表现为视神经椭圆形增粗,T1WI呈等信号,T2WI呈高低混杂信号。结论:MRI是检查和诊断视神经肿瘤的重要检查手段,对大多数病变可做出明确诊断。

MRI investigation of the diseases of optic nerve

Objective:To evaluate the MRI findings of the optic nerve diseases and their clinical value.Methods:MRI were performed in 18 cases with the optic nerve diseases.which were confirmed by pathology and clinical follow-up.Results:Optic nerve sheah meningioma was found in 8 cases.Of which,enlargement of optic nerve was seen in 1 cases,fusiform mass in 5 cases,and irregular mass in 2 cases.and The tumor showed hypo-or isointense mass on T_1-weighted images,and iso-or hyperintense mass on T_2-weighted images.Optic nerve glioma was found in 6 cases.Of which,2 cases showed diffuse enlargement of optic nerve and 4 cases displayed fusiform mass.The tumor showed hypointensity on T_1WI and hyperintensity on T_2WI.There were 4 case with metastases of optic nerve.Of which,3 cases were retinoblastomas involving the optic nerve.and 1 case resulted from carcinoma of the breast.The tumor showed hypointensity on T_1WI and hyperintensity on T_2WI.Conclusion:MRI imaging is an important examination method to the optic nerve diseases,the optic nerve diseases can be made correctly with MRI.