胚胎发育不良性神经上皮瘤的MRI特征分析  

MRI feature analysis of dysembryoplastic neuropithelial tumor

作　　者：王珂[1] 任芳[1] 张劲松[1] 郝跃文[1] 王虹[1] 印弘[1] 

机构地区：[1]第四军医大学西京医院放射科,陕西西安710032

出　　处：《中华神经外科疾病研究杂志》2017年第5期452-454,共3页Chinese Journal of Neurosurgical Disease Research

摘　　要：目的探讨胚胎发育不良性神经上皮瘤(DNET)的磁共振成像(MRI)特点。方法回顾性分析经手术病理证实的9例DNET的临床和影像资料。结果所有患者均表现为癫痫,8例发病年龄小于20岁,男多于女。位于颞叶者6例、顶叶1例、颞枕叶交界区1例、海马1例。所有病灶均呈长T1长T2信号,液体衰减反转恢复序列(FLAIR)示3例可见"环征",另6例均呈高信号。4例呈"三角征",4例呈类圆形或椭圆形,1例病变形态呈脑回样。6例呈单囊,2例呈多囊,6例病变内可见线样分隔。所有病灶边界清楚,周围无脑水肿,2例伴轻度占位效应,1例邻近颅骨受压变薄。增强扫描7例无强化,2例轻度强化。3例行扩散加权成像(DWI),均无扩散受限。2例行磁共振波谱(MRS),病变N-乙酰天门冬氨酸(NAA)较对侧降低,而胆碱(Cho)与对侧基本一致。结论 DNET的MRI表现具有一定特点,结合临床症状,有助于提高DNET的诊断准确率。Objective The image features of dysembryoplastic neuropithelial tumor （DNET） were analyzed. Methods The clinical and radiological data of 9 DNET cases confirmed by surgical pathology was retrospectively analyzed. Pesults The clinical appearances of all patients were epilepsy. The onset age of 8 cases was under 20. Male was mere than female. Six cases of DNET located in temporal lobe, 1 in parietal lobe, 1 in temporal occipital lobe and 1 in deep temporal lobe. All lesions showed hypointense on TIWI and hyperintense on T2WI. Fluid- attenuation inversion recovery （FLAIR） showed 3 lesions with hyperintense ＂ring sign＂, and the other 6 lesions with hyperintense. Four cases appeared as triangle shape, 4 presented quasi-circular or oval shape, and 1 appeared as gyrus-hke shape. Six lesions appeared as menesaccate, 2 lesions were polyeystie, and 6 lesions had internal filament septation. All lesions showed clear boundary and no peritumoral edema. Two lesions occurred mild mass effect. The skull remodeling was found in 1 case. Contrast enhanced MR/showed 7 cases without enhancement and 2 eases with slight enhancement. Diffusion weighted image （DWI） scanning of 3 patients showed no restricted diffusion. Two cases were applied magnetic resonance spectroscopy （MRS）, demonstrating lower N-acetylaspartate （NAA） level and basically equal Choline （Cho） level, compared to those of the eontralateral brain parenehyma. Condusion The imaging findings of DNEF have certain characteristics, which are helpful to improve the diagnosis accuracy while combined with clinical symptoms.

关 键 词：胚胎发育不良性神经上皮瘤 磁共振成像 

分 类 号：R739.41[医药卫生—肿瘤]