儿童期小脑星形胶质细胞瘤的MRI特征

目的　探讨小脑星形胶质细胞瘤的组织类型与MRI表现特征。方法　对 3 1例经病理证实的小脑星形胶质细胞瘤组织类型和MRI表现进行回顾性分析。结果　 3 1例小脑星形胶质细胞瘤中 ,3 0例 (96.8% )组织学证实为毛细胞型星形胶质细胞瘤 ;1例 (3 .2 % )为非毛细胞型星形胶质细胞瘤。MRI表现分为以下五型 :(1)假囊伴壁结节型 ,占 3 8.7% ;(2 )假囊型 ,占 16.1% ;(3 )囊性伴壁结节型 ,占 2 9% ;(4 )实质型 ,占 12 .9% ;(5 )移行型 ,占 3 .2 %。结论　毛细胞型星形胶质细胞瘤是儿童期小脑最常见的良性肿瘤 ,肿瘤在生长过程中可发生坏死和囊变 ,从实质型向其它各型演变。毛细胞型肿瘤血管为有孔型毛细血管 ,MRI增强可见肿瘤活性部分有明显强化

MRI Features of Cerebellar Astrocytomas in Children

Objective To further explore the histological type of cerebellar astrocytomas and MRI characteristics.Methods Thirty one patients with cerebellar astrocytomas proved by pathology were analyzed retrospectively.Results Of 31 patients with cerebellar astrocytomas,30(96.8%) cases were pilocytic astrocytomas and 1 (3.2%) non-pilocytic astrocytoma.MRI manifestations were divided into the following five types:(1)false cystic tumor with a mural nodule,accounting for 37.8%.(2)false cystic tumor,accounting for 16.1%.(3)cystic tumor with a mural nodule,accounting for 29%.(4)solid,accounting for 12.9%,and (5)transitional,accounting for 3.2%.Conclusion Pilocytic cerebellar astrocytomas are the most common central nerve system benign tumors in children.It can take place necrosis and cystic change in growth and convert the solid type into the other types above mentioned.Because the tumor capillaries were fenestrated vessels,the vital tissue of tumor usually enhanced markedly after administration of contrast media.