毛细胞型星形细胞瘤的CT、MRI表现及病理学基础  

The CT、MRI Features and Pathological Basis of Pilocytic Astrocytoma in the Brain

作　　者：许守利 马永华[1] 孙建刚[1] 任秀红[2] 丁霞[1] 

机构地区：[1]泗水县人民医院影像科,山东泗水273200 [2]山东大学山东省医学影像学研究所,山东济南250021

出　　处：《中国医学影像学杂志》2010年第2期175-178,共4页Chinese Journal of Medical Imaging

摘　　要：目的:探讨脑内毛细胞型星形细胞瘤(PA)的CT、MRI表现及病理学基础,以提高对此病的认识。材料和方法:回顾性分析经手术病理证实的脑内典型PA13例的CT与MRI表现。结果:位于小脑半球4例、小脑蚓部7例、右侧大脑半球2例。病变大小2.3cm×2.0cm×2.7cm～4.5cm×4.8cm×5.6cm。实性病变3例,CT平扫呈等密度软组织肿块,T1WI呈等信号,T2WI呈长信号或长信号中见少量短信号的混杂信号,CT及MRI增强后均表现为均质或不均质明显增强,其中2例病灶中心见少量无增强的低信号区,1例CT平扫见钙化灶。囊实性10例,MRI平扫显示肿瘤囊性部分呈长T1、长T2信号,实性部分呈等T1长T2信号,增强扫描实性部分明显增强,囊性部分无增强,3例见明显增强壁结节,2例病变呈多房性,增强后分隔明显增强,其中1例见短T1、长T2出血灶。结论:脑内PA的CT与MRI表现具有一定的特征性,结合临床资料有助于术前诊断。Purpose To investigate the CT and MRI findings of pilocytic astrocytoma （PA） and correlated them with pathologic findings for a better understanding.Materials and Methods The CT and MRI appearance of 13 cases of pathologic confirmed PA were retrospectively. Results Of the 13 lesions,4 located in cerebellar hemisphere,7 in the cerebellar vermis and 2 in the right cerebral hemisphere. The size of lesions ranged from 2.3×2.0×2.7 cm3 to 4.5×4.8×5.6 cm3. Three were solid lesions. They were iso-dense mass on plane CT images and one case had calcification. On MRI,they were isointense on T1W images and predominantly hyperintense on T2W images. All had marked homogeneous or inhomogeneous enhancement on enhanced CT and MR images. The other 10 were solid-cystic mass. On MRI,the cystic components showed hypoinensity on T1WI,hyperintensity on T2WI and no contrast enhancement. The solid components showed isointensity on T1WI,hyperintensity on T2WI and intense contrast enhancement. Of the 10 cases,3 lesions had mural nodule with strong enhancement,2 showed multicellular appearance with marked septal enhancement and 1 lesion had hemorrhage. Conclusion The CT and MRI findings are characteristic. Clinical data is also helpful for differential diagnosis.

关 键 词：星形细胞瘤 体层摄影术 X线计算机 磁共振成像 

分 类 号：R739.410.454[医药卫生—肿瘤]