小儿流行性乙型脑炎的MRI特征分析  

MRI Characteristics of Japanese Encephalitis in Children

作　　者：付玉川[1] 严志汉[1] 毛传万[1] 徐丽[1] 陈雄飞[1] 何家维[1] 

机构地区：[1]温州医学院附属第二医院放射科,浙江温州325027

出　　处：《实用放射学杂志》2011年第2期259-262,共4页Journal of Practical Radiology

摘　　要：目的探讨小儿流行性乙型脑炎的MRI特征。方法回顾性分析40例乙型脑炎患儿的MRI表现，分析病灶的好发部位及其信号特征，数据采用构成比表示。40例（男24例，女16例）均在发病3～30d期间行头颅常规T1W1、T2WI扫描，其中32例行轴位FLAIR扫描，31例行DWI扫描，7例行钆喷酸葡胺（Gd—DTPA）增强检查。结果颅内病变主要在T1WI呈稍低信号，在T2WI瞿稍高或高信号，在FI。AIR序列以稍高信号多见，在DWI上多数呈高信号，部分呈稍高信号。40例中，37例病灶累及丘脑（92．5％），15例累及基底节（37．5％），12例累及大脑脚（30％），8例累及大脑皮层（20％），5例累及脑干（12．5％），2例累及胼胝体（5％）。病灶常呈双侧对称性分布，增强扫描病灶均未见明显强化。结论小儿乙型脑炎的MRI的特征以双侧丘脑受累最多见，其次是基底节及大脑脚受累，而大脑皮层、脑干及胼胝体受累较少见。Objective To study MRI features of Japanese encephalitis （ JE ） in children. Methods MRI features of 40 cases with Japanese encephalitis were retrospectively analyzed, emphasis on the predominant sites and MR imaging characteristics of JE. All patients （24 boys and 16 girls） underwent MR scanning at 3 to 30 days after onset,including T1WI and T2WI in all cases,FLAIR in 32,DWI in 31 and contrast--enhanced scan in 7. The constituent ratios were used to analyze the lesions. Results Most lesions showed hypointensity on T1 WI and hyperintensity on both T2WI and FLAIR, and mainly hyperintensity on DWI. The lesions of JE were principally bilateral symmetric distribution , involving the thalamus in 37 cases （ 92.5% ） , the basal ganglia in 15 patients （37.5%） , the cerebral peduncle in 12（30%） , the cerebral cortex in 8（20%）,the brainstem in 5（12.5%）and the corpus callosum in 2 （5% ）. No abnormal enhancement of the lesions was found on contrast-- enhanced scan. Conclusion The thalamus is the most frequently involved with JE in children, followed by the basal ganglia, cerebral peduncle, cerebral cortex, brainstem and corpus callosum.

关 键 词：脑 脑炎 磁共振成像 

分 类 号：R512.32[医药卫生—内科学] R445.2[医药卫生—临床医学]