儿童小脑良性星形细胞瘤的MRI特征  

MRI Features of Benign Cerebellar Astrocytomas in Children

作　　者：程浩然[1] 魏光全[2] 杨久波 吴怀玉[2] 赵海涛[2] 宦怡[2] 

机构地区：[1]第四军医大学学员旅7队,陕西西安710032 [2]第四军医大学西京医院放射科,陕西西安710032 [3]吉林松原市中心医院放射科

出　　处：《实用放射学杂志》2004年第12期1130-1132,1138,共4页Journal of Practical Radiology

摘　　要：目的　探讨MRI在儿童小脑良性细胞瘤 (BCAs)诊断中的价值。方法　对 12名BCAs患儿临床及MRI资料进行回顾性分析。结果　 12例肿瘤中 7例定位于小脑半球 ,4例位于蚓部 ,1例位于第四脑室内。所有患儿均有脑积水 ,其中重度 9例 ,中度 3例。最常见的临床表现为头痛和呕吐 ,肿瘤直径为 2 3～ 68mm ,平均 42mm。 12例中 7例为囊性瘤 ,5例为实体瘤。与正常脑实质比较 ,在T1WI上 ,10例BCAs表现为为低信号影 ,9例在T2 WI上表现为高信号影。静脉注射对比剂后 ,12例中有 2例明显增强 ,5例为中度增强 ,5例未增强。出血和钙化分别为 1例、0例。结论　BCAs在MRI上的表现具有相对特征性 ;MRI对于BCAs的诊断和手术治疗方案的制定具有重要意义。Objective To study the MR imaging characteristics of benign cerebellar astrocytomas(BCAs) in children. Methods The clinical and MR imaging data of twelve patients with BCAs were reviewed and analyzed retrospectively.Results Of 12 tumors, 7 cases were located in the cerebellar hemisphere, 4 in the vermis, and 1 in the IV ventricle. All children were in company with hydrocephalus rated as extensive (n=9) or moderate (n=3). The tumors ranged in diameter from 23 mm to 68 mm, mean diameter 42 mm. Solid tumors were found in 5 children, and cystic areas occurred in 7 of 12 patients.BCAs were hypointense on T 1-weighted in 10 cases, and hyperintense on T 2WI in 9 cases compared with that of normal brain parenchyma. After contrast injection, BCAs marked (n=2), moderate (n=5), or absent (n=5) enhancement. Hemorrhage and calcification were not common (n=1,0, respectively).Conclusion BCAs has relative characteristic features on MRI in children, and MRI plays an important role in diagnosing and evaluating these tumors preoperatively.

关 键 词：小脑星形细胞瘤 脑肿瘤 磁共振成像 儿科学 

分 类 号：R445.2[医药卫生—影像医学与核医学]