摘要
目的:探讨毛细胞星形细胞瘤的MRI学特点。方法:回顾性分析经手术、病理证实的13例毛细胞星形细胞瘤的MRI学表现,探讨肿瘤的部位、形态、信号等特点,并和病理做对比分析。结果:13例毛细胞星形细胞瘤,儿童及青少年8例(61.5%),幕下8例(61.5),其中小脑蚓部5例(39%)。MRI扫描:肿瘤完全囊变者1例(7%),囊实性者9例(70%),实性者3例(23%),伴附壁结节者1例(7%)。T_1WI上囊性部分呈低信号,实性部分呈等低信号,T2WI上囊性部分呈高信号,实性部分呈等高信号。增强扫描囊性部分不强化,实性部分及附壁结节呈明显强化。肿瘤DWI低信号11例(84.6%),等低混杂样信号2例(15.4%),SWI可见低信号2例(154%)。伴有轻度瘤周水肿者及梗阻性脑积水各3例(46%)。结论:毛细胞星形细胞瘤好发于儿童及青少年,小脑蚓部多见,多为囊实性,占位效应较轻,MRI表现有其一定的特征性,可为临床术前提供信息。
Objective To evaluate the MRI features of pilocytic astrocytoma.Methods MRI manifestations of 13 cases of pilocytic astrocytoma proved by surgery and pathology were analyzed retrospectively,and features like site,morphology,and signal characteristics of tumor were discussed and compared with the pathology results.Results Of all the 13 patients,8 cases were children or teenagers（61.5%）,8 cases were in infratentorial region（61.5%）,including 5 cases in cerehellar vermis （39%）.Tumor MRI manifestations：1 case was completely cystic degeneration（7%）,9 cases were cystic-parenchyma（70%）,3 cases were parenchyma（23%）,with mural nodules in 1 case（7%）.The cystic part was hypo-intensity and parenchymal part was iso-intensity or hypo-intesity on T_1-weighted image,the cystic part was hyper-intensity and parenchymal part was iso- intensity or hyper-intensity on T_2-weighted image.After the administration of Gd-DTPA intravenously,the parenchymal part and episporium nodule showed marked enhancement,and the cystic degeneration showed no enhancement.Eleven tumors＇ DWI were hypo-intensity（84.6%）,2 were iso-intensity or hypo-intesity（15.4%）,2 tumors＇ SWI were iso-intensity or hypo-intesity（15.4%）.Six tumors had peritumoral edema and obstructive hydrocephalus（46%）.Conclusion The pilocytic astrocytoma usually happens in children and teenagers＇ cerebellar vermis.Most of the tumors are cystic-parenchyma,and MRI of pilocytic astrocytoma has characteristics,which may provide information for preoperative clinic.
出处
《医疗卫生装备》
CAS
2012年第4期65-67,70,共4页
Chinese Medical Equipment Journal
关键词
毛细胞星形细胞瘤
颅内肿瘤
磁共振成像
病理
鉴别诊断
pilocytic astrocytoma
intracranial tumor
magnetic resonance imaging
pathology
differential diagnosis
