胚胎发育不良性神经上皮肿瘤的MR影像特征分析  

The MRI features of dysembryoplastic neuroepithelial tumors

作　　者：朱明旺[1] 赵殿江[1] 杜铁桥[1] 王丽宁[1] 张旭妃[1] 

机构地区：[1]首都医科大学第十一临床医学院北京三博脑科医院影像科,北京100093

出　　处：《磁共振成像》2012年第3期164-167,共4页Chinese Journal of Magnetic Resonance Imaging

基　　金：北京市科委首都临床特色应用研究项目(编号:Z111107058811094)资助

摘　　要：目的分析脑胚胎发育不良性神经上皮肿瘤(DNET)的MR影像特征。方法回顾性总结14例经手术病理证实的DNET的MR影像改变,重点包括肿瘤部位,形态,信号改变等。结果 14例DNET中位于额叶7例,颞叶5例,顶叶2例。病变以累及大脑皮层为主,表现为较均匀的长T1、长T2信号,FLAIR像呈低信号,病变边缘见FLAIR像高信号影环绕。9例病变为三角形或楔形,5例可见肿瘤沿脑皮层分布。10例病变内可见多发大小不等圆形囊性结构。7例病变浅表者均可见病变邻近颅骨骨质吸收、变薄。13例患者病变无强化,12例扩散加权像中11例患者表现为低信号影。结论 DNET具有比较典型MR影像学改变,病变形态、信号、囊变影像改变有助于正确诊断DNET。Objective： To analyze the MRI features of dysembryoplastic neuroepithelial tumors （DNET）. Materials and Methods： The MR study of 14 patients with pathologic confirmed DNET was reviewed retrospectively with emphasize on tumor location, morphology, and characters of signal intensity. Results： In 14 DNET, 7 of them located in frontal lobe, 5 in temporal, and 2 in parietal lobe. All lesions involved the brain cortex with hypointense TIWI and hyperintense T2WI without contrast enhancement. FLAIR images showed a hyperintense ring surrounding the lesion. DNET displayed a triangle or wedge-shape lesion in 9 cases. Cystic structure was found in 10 patients. The skull remodeling was found in all 7 superficial DNET. Thirteen DNET showed no contrast enhancement. In 12 DWI scan, the tumor showed increased water diffusion in 11 cases. Conclustion： DNET has a relatively typical MR appearances. Lesion location and morphology, signal intensity, and multiple microcyst might help to make the diagnosis in patient with a DNET.

关 键 词：磁共振成像 胚胎发育不良性神经上皮肿瘤 

分 类 号：R445.2[医药卫生—影像医学与核医学] R739.4[医药卫生—诊断学]