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目的探讨颅脑不典型原始神经外胚层肿瘤(primitive neuroectodermal tumors,PNET)的磁共振(magnetic resonance imaging,MRI)影像特征。方法回顾分析3例少见部位PNET的平扫及增强MRI检查资料。结果 3例不典型PNET分别位于左侧丘脑、脑干、右侧顶骨等罕见部位,3例肿瘤存在液化坏死且其均位于肿瘤边缘;肿瘤强化程度与囊变程度无关,与病理结果一致。结论发生于颅脑罕见部位的不典型PNET,易与其它肿瘤混淆,误诊率高,正确认识其MRI特征性表现,对术前诊断本病及提高诊断率有重要参考价值。
Objective To explore the features of magnetic resonance imaging (MRI) of primitive neuroectodermal tumors (PNET) in the brain. Methods Retrospective analysis of 3 cases of rare parts of PNET plain and enhanced MRI examination data. Results Three cases of atypical PNET were located in the rare sites of the left thalamus, brainstem, right parietal bone respectively. Three of the tumors had liquefaction and necrosis and were located at the edge of the tumor. The extent of tumor enhancement was not related to the extent of cystic change and was consistent with the pathological findings. Conclusions The atypical PNET occurring in the rare parts of the brain is easily confused with other tumors. The misdiagnosis rate is high, and its characteristic features of MRI are correctly understood. Therefore, it is an important reference value for diagnosing the disease preoperatively and improving the diagnosis rate.