摘要:目的:探讨MRI常规扫描和ASL及-H—MRS对线粒体脑肌病伴高乳酸血症和脑卒中样发作(Mitochondriale/1.cephalopathywithlacticacidosisandstroke—likeepisodes,MELAS)综合征的诊断价值。方法:对9例MELAS综合征患者(男6例,女3例,年龄7~35岁)行头部MR常规轴位、冠状位、矢状位平扫及增强扫描,ASL灌注成像和1H—MRS检查。结果:9例患者中2例双侧发病,7例单侧发病。1例累及小脑半球,MRI平扫示顶叶、枕叶、颞叶皮层肿胀,T1WI呈稍低信号,T2WI呈稍高信号,FLAIR呈高信号,DWI呈高信号,ADC图呈低信号,增强扫描呈脑回样强化。ASL病变区呈高灌注。1H-MRS扫描当TE为35ms时,NAA峰降低,Cho峰略升高,并见Lac双峰,当TE为144ms时,见倒置Lac双峰。结论:MELAS综合征的MRI和ASL及1H-MRS表现具有特征性,MRI和ASL及-H—MRS对其诊断及鉴别诊断有重要价值。
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