脑室脑膜瘤的MRI诊断  

MRI diagnosis of ventricular meningioma

作　　者：王文娜[1] 周倩静[1] 曾利泉[1] 蔡鹏杰[1] 

机构地区：[1]广州军区总医院157临床部放射科,中国广州510510

出　　处：《医学影像学杂志》2012年第3期345-347,共3页Journal of Medical Imaging

摘　　要：目的分析脑室脑膜瘤的MRI表现特点,旨在提高对其诊断的准确率。方法对经手术病理证实的14例脑室内脑膜瘤进行回顾性分析,均行颅脑MR平扫及增强扫描检查。结果肿瘤6例位于右侧侧脑室,7例位于左侧侧脑室,其中11例位于侧脑室三角区,1例位于三脑室。肿瘤9例呈类圆形,体积较大,边界较清,T1WI表现为等或稍低信号,T2WI表现为等、稍高或稍低信号,内可见斑片状短T1长T2或长T1长T2信号,增强扫描肿瘤实性部分呈明显均匀强化;可伴有不同程度的占位效应及瘤周水肿;多伴有脑室的明显扩张。结论脑室脑膜瘤的MRI表现有一定的特征性,结合临床和发病部位、年龄、性别,可提高诊断准确率。Objective To analyse the MRI features of ventricular meningioma and to improve the dianostic aacuracy of this disorder.Methods The pre-and post-contrast MR images of 14 cases with ventricular meningioma confirmed by surgery and pathology were analyzed retrospectively.Results Among all the 14 cases,6 lesions located in the right ventricle,6 in the left ventricle,most of which located in lateral ventricular trigone and 1 in the Ⅲ ventricle.Most tumors were somewhat round,with bulky volume and clear boundary.The tumors appeared isointense or slightly hypo-intense singals on T1-weighted image and isointense,slightly hyper-intense or slightly hypo-intense singals on T2-weighted image.There were slice-shape T1 high signal and T2 high signal or T1 low signal and T2 high signal in some tumors.After adiministration of contrast medium,the parenchyma of the tumors was demonstrated hyperdense with marked inhomogeneous enhancement.There were varying degrees of space occupying effect and peritumoral edema,and the ventricle was obviously dilated.Conclusion There are some rather characteristic MRI features in ventricular meningioma.It is possible to improve accuracy of diagnosis of ventricular meningioma combining with the tumor＇s location and the patient＇s age and sex.

关 键 词：脑室 脑膜瘤 磁共振成像 

分 类 号：R739.41[医药卫生—肿瘤] R445.2[医药卫生—临床医学]