摘要
目的:探讨可逆性后部脑病综合征(PRES)CT与MRI表现及诊断价值。方法:回顾性分析8例PRES临床和影像学资料,7例常规行CT检查,8例常规行MRI检查,5例行弥散加权成像(DWI),其中3例同时行钆喷替酸葡甲胺(Gd-DTPA)增强扫描。结果:CT阳性率57%,MRI阳性率100%。枕叶受累8例,小脑3例,额顶叶皮质下白质3例,脑干2例,尾状核2例,丘脑1例。在脑叶表现为脑回样异常信号,其它部位斑片样异常信号;T1WI呈略低或等信号,T2WI和FLAIR像显示明显高信号。增强扫描2例无强化,1例呈脑回样、斑片样和环样强化。DWI扫描1例呈略高信号,1例呈高信号,1例呈低信号,2例未见异常。结论:PRES的MRI表现具有特征性,MRI应作为诊断本病的首选手段。
Objective： To study the CT and MRI features of posterior reversible encephalopathy syndrome （PRES） and assess their value. Method： The clinical and imaging data of 8 patients were analyzed retrospectively, 7 patients accepted routine CT examination, 8 patients accepted routine MRI examination, 5 had DWI and among them 3 accepted contrast enhanced scan. Results： The positive ratio of CT was 57% and MRI was 100%. The occipital lobe was involved in 8 cases, cerebella in 3 cases, brain stem in 2 cases, fronto-parietal subcortical white matter in 2 cases, caudate nucleus in 2 cases and thalamus in 1 case. The lesion showed gyms-like abnormal signals in lobes and patchy abnormal signals in the other areas. The lesion showed low or iso signal on T1WI and high signal on T2WI and FLAIR. Contrast enhanced scanning showed no enhancement effect in 2 cases and gyrus, patchy and ring-like enhancement in another. The lesions demonstrated mild high signal in 1 case, high signal in 1 case, low signal in 1 case and no signal changes in 2 cases on DWI. Conclusion： The imaging findings of PRES are typical, so MRI should be the first choice in its diagnosis.
出处
《中国临床医学影像杂志》
CAS
北大核心
2007年第3期160-163,共4页
Journal of China Clinic Medical Imaging
关键词
脑疾病
体层摄影术
X线计算机
磁共振成像
brain disease
tomography, X-ray computed
magnetic resonance imaging
