儿童幕上原始神经外胚层肿瘤的MRI诊断及病理对照研究
Journal of China Clinic Medical Imaging(2017)
Abstract
目的:探讨儿童幕上原始神经外胚层肿瘤(sPNET)的MRI表现特点.方法:收集经手术及病理证实的20例sP-NET,所有病例均行常规MRI平扫和增强扫描,并行DWI扫描.结果:20例sPNET分别位于大脑半球的额、颞、顶、枕、岛叶及侧脑室内,14例为巨大囊实性肿瘤,4例以实性为主伴发小囊性变肿瘤,2例肿瘤体积小且以钙化为主.所有病例瘤周无水肿或水肿较轻,合并出血5例,3例术后复查沿蛛网膜下腔播散.MR平扫肿瘤呈混杂信号,肿瘤实性部分T1WI呈等或稍低信号,T2WI呈等或稍高信号,DWI呈高信号,ADC图呈低信号,囊变部分信号复杂.增强检查肿瘤实性部分呈中等或明显强化.结论:sP-NET影像学表现有一定特征,尤其是DWI,这可能有助于肿瘤定性诊断,同时能够提供肿瘤浸润的范围、有无蛛网膜下腔种植转移,对疾病分期和制定治疗方案有重要价值.
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Key words
Neuroectodermal tumors,primitive,Child,Pathology,Magnetic resonance imaging
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