中枢神经细胞瘤的MRI征象分析

目的 分析中枢神经细胞瘤(CNC)的MRI表现,提高对此病的诊断能力.方法 回顾性分析经手术病理证实的12例CNC患者的影像学资料.所有患者均行MR平扫和增强扫描,其中3例行CT平扫.结果 12例CNC均位于侧脑室透明隔区,临近孟氏孔处,右侧脑室5例,双侧脑室5例(1例突入三脑室),左侧脑室2例(1例突入三脑室).肿瘤平均长径约4.8 cm(2.2～7.8 cm).11例肿瘤(92％)有不同程度囊变,8例可见肥皂泡或海绵样囊变(66.7％)、1例完全囊变(8.3％).1例可见血管流空信号,3例(25％)矢状位可见扇形征.肿瘤实性部分与灰质信号相近,T2FLAIR上呈稍高信号.9例行扩散加权成像(DWI),7例呈高信号,呈等信号或稍低信号各1例.MRI增强扫描10例肿瘤实性部分呈轻至中度强化(83％),2例呈明显强化(17％).结论 青年人,侧脑室透明隔区的肿瘤,多伴囊变,增强肿瘤实性部分呈轻至中度强化,应首先考虑CNC的诊断.

MRI fingings of central neuroeytoma

Objective To analyze the MRI features of central neurocytoma (CNC),and to improve the diagnostic accuracy of this lesion.Methods The MRI findings of 12 patients with CNC confirmed by surgery and pathology were evaluated retrospectively.All patients underwent contrast-enhanced and uncontrast-enhanced MR scan,and 3 patients also received plain CT scan.Results The lesions of 12 cases were all located in the lateral ventricles of septum pellucidum,which were close to the Monro's foramen.5 lesions located in the right lateral ventricle,5 lesions located in both lateral ventricles with 1 case reached the third ventricle,2 lesions located in the left lateral ventricle with 1 case reached the third ventricle.The mean diameter of the CNC lesions was 4.8 cm (ranged from 2.2 to 7.8 cm).11cases (92％) had vavious degrees of cystic change,8 cases (66.7％) had a spongy or soap bubble appearance and 1 case(8.3％) had completely cystic change.3 cases (25％) had a scalloping appearance on sagittal T1-weighted MRI.The solid part of the tumor was similar to the gray matter in signal intensity,with slightly high signal intensity on T2FLAIR.Among 9 cases with DWI,7 cases showed high signal intensity,1 case showed equal signal intensity,and 1 case showed slightly low signal intensity.On enhanced MRI,the solid part of tumors showed slight to medium (83％) or obvious (17％) enhancement.Conclusion CNC should be first considered when a young adult has a lesion located in the lateral ventricles of septum pellucidum,accompainied by varying degrees of cysts,showed slight to medium enhancement in the solid part of the tumor.