胚胎发育不良性神经上皮肿瘤的MRI表现

目的 探讨胚胎发育不良性神经上皮肿瘤(DNT)的MRI影像学表现及临床特点,以期提高对DNT的诊断水平.方法 收集经手术病理证实的12例DNT患者临床资料,回顾性分析其影像学表现及临床特点.结果 12例患者肿瘤均位于幕上大脑半球皮层内,颞叶8例,额叶及顶叶各2例,其中6例累及邻近脑白质.MRI平扫中,T1WI呈低或等低混杂信号,T2WI及FLAIR呈高信号,肿瘤表现为囊性或以囊性部分为主,部分内可见网状分隔.5例病灶表现为"三角征",5例表现为"脑回征",另2例表现为圆形病灶.肿瘤均无明显占位效应,1例瘤周轻度水肿,增强扫描仅1例有轻度不均匀强化.结论 DNT符合一般良性肿瘤的生物学特征,MRI诊断价值很大.大脑半球皮层内囊性病变,无占位效应,瘤周无水肿,出现"三角征"和"脑回征"等征象可提示DNT的诊断.

Abstract：

Objective To study the MRI appearance and clinical features of dysembryoplastic neuroepithelial tumor (DNT) to improve accurate diagnosis of DNT. Methods The clinical data and MRI appearance of 12 patients with DNT confirmed by surgery and pathology were analyzed retrospectively. Routine MRI was performed in all of the 12 patients, and also dynamic contrast-enhanced MR imaging in 10 of them. Results Eight lesions resided in the temporal lobes, 2in the frontal lobe, and the other 2 in the parietal lobe. All of the 12 DNTs located in supratentorial hemisphere cortex, and 6 of them encroached the adjacent white matter. The lesions appeared as hypointense or iso-hypointense signal on T1WI of MRI, and hyperintense on T2WI and FLAIR of MRI.Cystic structure was shown in all the lesions or as its main part, and mesh-separated structure was also noted in some of the tumors. Five lesions appeared as a triangle in shape, 5 in gyrus-like shape and the remaining 2 in round shape. All the tumors had no significant mass effect with 1 having mild edema around the tumor. Enhanced MR imaging showed only 1 lesion having slight and heterogeneous enhancement. Conclusion DNT is accorded with general tumor's biological characteristics. MRI has great value on DNT's diagnosis. If a cystic lesion locates in the hemisphere cortex with a triangle in shape or gyrus-like shape, having no significant mass effect and peripheral edema, it has a great possibility of being DNT.

MRI appearance of dysembryoplastic neuroepithelial tumor

Objective To study the MRI appearance and clinical features of dysembryoplastic neuroepithelial tumor (DNT) to improve accurate diagnosis of DNT. Methods The clinical data and MRI appearance of 12 patients with DNT confirmed by surgery and pathology were analyzed retrospectively. Routine MRI was performed in all of the 12 patients, and also dynamic contrast-enhanced MR imaging in 10 of them. Results Eight lesions resided in the temporal lobes, 2in the frontal lobe, and the other 2 in the parietal lobe. All of the 12 DNTs located in supratentorial hemisphere cortex, and 6 of them encroached the adjacent white matter. The lesions appeared as hypointense or iso-hypointense signal on T1WI of MRI, and hyperintense on T2WI and FLAIR of MRI.Cystic structure was shown in all the lesions or as its main part, and mesh-separated structure was also noted in some of the tumors. Five lesions appeared as a triangle in shape, 5 in gyrus-like shape and the remaining 2 in round shape. All the tumors had no significant mass effect with 1 having mild edema around the tumor. Enhanced MR imaging showed only 1 lesion having slight and heterogeneous enhancement. Conclusion DNT is accorded with general tumor's biological characteristics. MRI has great value on DNT's diagnosis. If a cystic lesion locates in the hemisphere cortex with a triangle in shape or gyrus-like shape, having no significant mass effect and peripheral edema, it has a great possibility of being DNT.