摘要
目的探讨毛细胞型星形细胞瘤的CT、MRI特征。资料与方法回顾性分析16例经手术病理证实的毛细胞型星形细胞瘤的CT及MRI表现。结果毛细胞型星形细胞瘤影像学表现有以下特点:(1)青少年易发病,20岁以下多见;(2)病变好发于小脑;(3)肿瘤呈类圆形,伴有不同程度囊变,根据囊变程度可分为囊肿型、囊肿结节型和肿块型,以囊肿结节型最多见;(4)肿瘤囊性部分CT平扫呈低密度,MRT1WI呈明显低信号,T2WI呈明显高信号;肿瘤实性部分、囊壁及壁结节CT呈等或稍低密度,MRT1WI呈等或稍低信号,T2WI呈稍高信号。增强后肿瘤囊壁不强化或轻度强化,壁结节及实性部分明显强化,囊性部分不强化;(5)肿瘤边界清楚,瘤周无水肿;(6)肿瘤出血与钙化少见。结论毛细胞型星形细胞瘤在CT、MRI上表现有一定特征,有助于术前与其他肿瘤的鉴别。
Objective To discuss the MRI and CT imaging features of pilocytic astrocytoma. Materials and Methods The MRI and CT imaging features of 16 cases with pilocytic astroeytoma proved by operation and pathology were retrospectively analyzed. Results The MRI and CT imaging features of pilocytic astrocytoma were as follows ： （ 1 ） The tumors usually occurred in adolescents, especially below 20 years old. （2） The tumors mostly located in cerebellum. （3） The tumors tended to be round shape and cystic degeneration, according to the degree of cystic degeneration, lesions can be divided into cyst type, cyst tubercle type and mass type, cyst tubercle type was the most common. （4） The cystic part of tumor appeared hypodensity on CT and obvious hypointensity signal on T1 WI and obvious hyperintensity signal on T2 WI; the solid part of tumor, the cystic wall and wall tubercle appeared iso-or hypodensity on CT and iso-or slightly hypointensity signal on T1 WI and shghtly hyperintensity signal on T2 WI. After injection of contrast media, the tumor cystic wall did not enhance or slightly enhanced, the tumor wall tubercle and the solid part enhanced markedly, the cystic part of tumor did not enhance. （5） The tumors were sharply demarcated without edema. （6） Hemorrhage or calcification was rarely seen. Conclusion The MRI and CT appearance of pilocytic astrocytoma have some characteristics, which is helpful to differentiate the tumor from other lesions before operation.
出处
《临床放射学杂志》
CSCD
北大核心
2007年第6期539-542,共4页
Journal of Clinical Radiology
