12例视神经胶质瘤MRI分析

目的探讨视神经胶质瘤的MRI诊断及鉴别诊断。方法回顾分析12例经手术病理证实视神经胶质瘤的MRI表现及动态增强特征。结果不规则肿块5例,梭形增粗3例,纡曲形增粗4例。累及眶内段11例、管内段8例、球内段1例、视交叉4例、视束1例。肿瘤在T1WI上为略低、等信号,T2WI上为略高、等、低信号;信号均匀10例,肿瘤内有囊变而信号不均2例;肿瘤无强化3例,轻度强化6例,明显强化3例。9例行动态增强检查;时间信号曲线3例呈平直型,4例呈缓升型,2例呈速升平台型。结论 MRI在显示视神经胶质瘤位置形态、肿瘤侵犯范围、肿瘤信号特征均有典型表现。

Analysis of MRI on 12 patients with optic nerve glioma

Objective:To evaluate the diagnosis and the differential diagnosis by MRI on patient with optic nerve glioma.Materials and Methods:The manifestations of MRI were retrospectively analyzed in 12 patients with optic nerve glioma whom confirmed by the operation and pathology.Results:In the shape,it revealed as irregular in 5 cases,fusiformis 3 cases,tortuous 4 cases.The glioma involved the orbit in 11 cases,intracanal segment 8 cases,intraocular segment 1 case,optic chiasm 4 cases,optic tract 1 case.For MRI,the presentations of the tumor revealed as iso-or hypointense signal on T1-weighted images,and iso-or hypointense,or hyperintense signal on T2-weighted images.In the tumor,there was homogeneous signal in 10 cases,and cyst lesions with inhomogenous signal in 2 cases,there was not enhanced in 3 cases,enhanced slightly 6 cases,enhanced obviously 3 cases.Nine patients were undergone dynamic contrast-enhanced MRI and time-signal intensity curve including flat in 3 cases,gentle slope in 4 cases and straight slope in 2 cases.Conclusion:It is typically to reveal the features of location,shape,and extent of optic nerve glioma on MRI.MRI is of great value to make a diagnosis and differential diagnosis on optic nerve glioma.