脑室外神经细胞瘤的MRI表现

目的:探讨脑室外神经细胞瘤(EVN)的MRI特征性表现,提高对此病的认识.方法:回顾性分析经手术病理证实的7例EVN的临床及MRI检查资料,结合文献总结其MRI特点.结果:7例中2例病灶位于额叶,1例位于顶叶,2例位于中脑,1例位于松果体,1例位于颈髓.MRI T1 WI示肿瘤呈不均匀低信号或等信号,T2 WI及FLAIR图像上呈不均匀高信号,可见多发囊变,瘤周伴(3例)或不伴(4例)水肿,2例可见出血,呈片状或点状;增强扫描示病变实质部分呈絮状不均匀强化(4例)或不强化(1例),囊变区呈环形强化.结论:EVN的发生部位和MRI表现多种多样,MRI检查有助于诊断,但确诊仍需依靠病理检查.

MRI manifestations of extra-ventricular neurocytoma

Objective：To study the MRI characteristics of extra-ventricular neurocytoma （EVN） ,in order to improve the understanding of this disease entity. Methods： The clinical and MRI findings of 7 cases with surgery and pathology proven EVN were retrospectively analyzed, and literatures were reviewed. Results：Of the 7 patients, the tumor located in frontal lobe （n= 2）,midbrain （n=2） and in parietal lobe, cervical cord and pineal region for one case of each respectively. The tumors presented as heterogeneous hypo-intensity or iso-intensity on T1WI and heterogeneous hyper-intensity on T2WI and FLAIR sequences. Multiple cystic changes,with （n= 3） or without （n= 4） peritumoral edema could be assessed. Intra-tumoral hemorrhage was observed in two lesions showing patchy or spotty appearances. Lesions showed as flocculent heterogeneous enhancement （n= 4） or non-enhancement （n= 1） after contrast administration. Ring-like enhancement was found in cystic area of the tumor. Conclusion： The localization and MRI manifestations of EVN varied, frontal lobe was most frequently involved. MR1 is helpful in the diagnosis of EVN, yet the final diagnosis might still depend on pathology.