中枢神经细胞瘤的不典型影像表现

Atypical Imaging Features of Central Neurocytoma

目的探讨中枢神经细胞瘤(central neurocytoma,CNC)的不典型影像学表现,以提高对该病的认识。资料与方法回顾性分析6例经手术病理证实的CNC的不典型CT、MRI表现。6例均行MR平扫,4例行MR增强扫描,2例同时行CT平扫。结果 6例CNC在发生部位或信号(密度)/强化方面均有不典型表现。一类是发生部位少见,1例(4岁)位于第四脑室,T1WI呈低信号,T2WI呈均匀高信号(与脑脊液信号相仿),并见瘤周水肿;1例位于透明隔及双侧侧脑室体部前2/3;1例肿瘤自右侧丘脑向侧脑室内生长;另一类是信号(密度)/强化表现不典型,1例肿瘤位于第三脑室Monro孔区,MR平扫表现为环状等T1、长T2信号,增强扫描呈不规则环状显著强化;另2例肿瘤均位于侧脑室透明隔,1例CT示肿瘤内大片状钙化,另1例CT示大面积瘤卒中。结论 CNC可有少见的不典型影像表现。

Objective To study the atypical imaging features of central neurocytoma,in order to make a further recognition of the disease. Materials and Methods Atypical imaging findings of 6 cases with pathologically proved neurocytoma were retrospectively reviewed. Conventional plain MRI were performed in all patients,enhance MR scan were performed in 4 cases,CT plain scan were performed in 2 cases. Results All the tumors had atypical imaging findings in location or signal（density）/ enhancement.1 case （ aged 4 years） located in fourth ventricle,showed hypointensity signal on T1WI,homogeneous hyperintensity signal similar to CSF with edema on T2WI;1 case located in front of 2/3 of the bilateral ventricles;1 case located at left thalamus extending to left lateral ventricle;1 case located in third ventricle near the foramen of Monro,showed annular isointensity signal on T1WI,hyperintensity signal on T2WI,and marked annular enhancement was found;2 tumors located at the septum pellucidum between the lateral ventricles,1 case showed large flaky calcification on CT;1 case showed massive hemorrhage in tumor on CT. Conclusion CNC has some atypical imaging features.