视神经胶质瘤的MRI表现

目的视神经胶质瘤的MRI表现。方法总结经手术病理证实的15例视神经胶质瘤的MRI特征。15例均行横轴位、冠状位和斜矢状位平扫加增强扫描。结果15例视神经胶质瘤均累及眶内段，其中累及球内段3例、管内段7例、视交又4例、视束1例。视神经迂曲形增粗5例，梭形增粗4例，不规则肿块4例，圆形肿块1例，哑铃形1例。肿瘤在T1WI上为略低或等信号，T2WI上为略高、等、低信号；肿瘤内信号均匀12例，信号不均3例；肿瘤无强化4例，轻度强化6例，明显强化5例。结论MRI在显示视神经胶质瘤位置形态、信号特征及强化特点均有典型表现。

MRI manifestations of optic gliomas

Objective To study the MRI findings of optic glioma. Methods Axial, coronal and oblique sagittal high- resolution MR images of 15 patients with pathologically confirmed optic gliomas were analyzed. Results The intraorbital optic nerves were involved in all patients including intraoeular （3）, intracanalieular （7）, optic chiasm （4）, and optic tract （1） involvement. The optic nerve was tortuous （5）, fusiform （4）, irregular （4）, round （1）, or dumbbell-shaped （l）. The tumor was homogeneously （12） T1 iso- or hypointensc and T2 iso- or hyperintense, cystic with heterogeneous signal intensities （3）. There was no （4）, slight （6）, or marked （5） contrast enhancement in the lesions. Conclusions MRI provides detailed information on the morphology, signal characteristics and enhancement of optic ~liomas.