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目的 探讨幕上原始神经外胚叶瘤 (SPNET)的MRI及CT特征。方法 回顾性分析 10例经手术病理证实的SPNET的MRI及CT表现。结果 SPNET的影像学表现有以下特点 :( 1)肿瘤呈类圆形 ,边界清楚 ,病灶周围无水肿或水肿较轻 ,且大部分位于中线附近及侧脑室旁 ,少数位于皮层下。 ( 2 )MRI示肿瘤实质T1WI呈稍低或等信号 ,T2 WI呈等信号 ,与脑灰质信号相等 ,增强较明显。 ( 3 )CT示肿瘤实质呈稍高密度 ,影像学表现与髓母细胞瘤相似。 ( 4)中线附近的肿瘤为实体结构 ,无囊变 ;囊变明显的肿瘤多位于皮质下。 ( 5 )部分肿瘤内有出血或钙化 ,有的可见到脑脊液扩散灶。结论SPNET影像学表现有一定特征 ,结合其影像学表现及临床症状有助于与其他肿瘤区分
Objective To investigate MRI and CT features of supratentorial primitive neuroectodermal tumor (SPNET). Methods The MRI and CT findings of 10 cases with pathologically confirmed SPNET were retrospectively analyzed. Results SPNET imaging showed the following characteristics: (1) tumor was round, clear boundary, no edema or edema around the lesion lighter, and most are located near the midline and lateral ventricle, a few in the cortex. (2) MRI showed slightly lower or equal signal on the T1WI of the tumor and equal signal on the T2WI, which was equal to the gray matter signal of the brain and the enhancement was more obvious. (3) CT showed a slightly higher density of the tumor, the imaging findings and medulloblastoma similar. (4) the tumor near the midline is a solid structure, no cystic change; cystic lesions were mostly located in the cortex. (5) part of the tumor bleeding or calcification, and some can be seen diffuse cerebrospinal fluid. Conclusion SPNET imaging has certain features, combined with its imaging findings and clinical symptoms contribute to the differentiation of other tumors