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[目的]分析小儿颈部原始神经外胚层肿瘤(PNETs)的影像学特征。[方法]对6例经病理证实的PNETs的MSCT及MR表现进行回顾性分析。[结果]4例CT表现为溶骨性骨质破坏和明显的软组织肿块,骨质破坏区无骨膜增生、骨质硬化和瘤骨形成,软组织肿块的密度不均匀;2例CT表现为相对较小的软组织肿块影,其内见明显坏死,相应骨质未见明显破坏;4例MR表现为颈部较大的软组织肿块,T1WI呈等低信号,T2WI呈等高信号,相应骨质在T1WI、T2WI呈混杂等高信号。2例表现为颈部见相对较小的软组织肿块,T1WI呈等低信号,T2WI呈等高信号。[结论]PNETs的影像学表现缺乏特征性,但MSCT的后台处理技术及MR的多层面扫描能较好地显示肿瘤的内部结构,明确肿瘤范围,对鉴别诊断有着重要的指导作用。
[Objective] To analyze the imaging features of pediatric primitive neuroectodermal tumors (PNETs). [Methods] The MSCT and MR findings of 6 pathologically confirmed PNETs were retrospectively analyzed. [Results] CT showed osteolytic osteolysis and obvious soft tissue mass in 4 cases, without periosteal hyperplasia, bone sclerosis and tumor formation in bone destruction area, and uneven density of soft tissue mass in 2 cases. Small soft tissue mass showed obvious necrosis and no obvious destruction of the corresponding bone mass. In 4 cases, MR showed a large soft tissue mass with a narrow neck. T1WI showed a low signal and T2WI showed a high signal. The corresponding bone in T1WI , T2WI was mixed contour signal. 2 cases showed a relatively small soft tissue mass in the neck, T1WI showed low signal, T2WI showed high signal. [Conclusion] The imaging manifestations of PNETs are lack of characteristic. However, MSCT background processing and MR multi-slice scan can better display the internal structure of tumor and clarify the tumor range, which has an important guiding role in differential diagnosis.