中枢神经细胞瘤的影像学特征分析

目的:研究中枢神经细胞瘤的影像学特征,提高其术前诊断准确率。方法:回顾分析15例经病理证实的中枢神经细胞瘤的CT、MRI表现。结果:15例中14例位于幕上脑室内,1例位于左额叶并累及胼胝体。肿瘤均呈不规则分叶状。CT上,肿块呈等或稍高密度,其中7/12(58.3%)可见点、片状或条带状钙化。MR平扫,2例肿瘤呈实体性,余均为囊-实混合性,肿瘤实体部分与灰质相比于T1WI呈等信号,T2WI等或稍高信号;囊性部分表现为肿瘤边缘或内部多发的"蜂窝"状或"丝瓜瓤"样脑脊液信号区。增强检查,肿瘤的实体部分、囊壁及分隔均呈中度至明显强化。结论:虽然中枢神经细胞瘤的发生率较低,但其在发病部位、影像学表现等方面具有一定的特征性,结合患者年龄及临床表现,术前可对多数病例做出定性诊断。

Imaging features of the central neurocytoma

Objective:To investigate the CT and MRI features of the central neurocytoma(CNC) and improve preoperative diagnosis.Methods:CT and MRI appearances in 15 cases of CNC with pathology-proved were analyzed retrospectively.Results:Among the 15 cases,the tumours in 14 cases were located in supratentorial ventricles,while one was located in the left frontal lobe with corpus callosum invaded.On CT scan,the tumours appeared iso-or slightly high density.Dot or mass calcifications could be seen in 7/12(58.3%) of tumours.On pre-contrast MR scan,2 of the tumours showed solid pattren while the rest of the tumours appeard mixed cystic-solid pattern,the solid part showed iso-T1 and iso-/hyper-T2 signal intensity compared with gray matter.The cystic part showed "honeycomb" or "vegetable sponge" patternlike areas with long T1 and long T2 signal intensity which were similar to CSF.On post-contrast MR scan,the solid part,cystic wall and septa demonstrated moderate or obvious enhancement.Conclusion:Although the incidence of CNCs is rare,preoperative diagnosis can be made in most of cases due to the specific location,imaging features,and clinical data.