妊娠高血压综合征致后部可逆性脑病综合征的影像学表现

目的 探讨妊娠高血压综合征(pregnancy-induced hypertension,PIH)致后部可逆性脑病综合征(posterior reversible encephalopathy syndrome,PRES)的影像学特点.方法 3l例PHI患者均行CT平扫,MPd平扫+弥散加权成像(diffusion-weighted imaging,DWI).结果 31例PIH患者CT平扫均可见顶枕叶分水岭区低密度影,CT值19～23 Hu;其中11例MRI表现为T1稍低信号,T2稍高信号,液体衰减反转恢复序列旱高信号,DWI旱等信号,表观弥散系数不下降;临床症状恢复时间早于MRI影像学恢复时间.结论 PIH妊娠晚期发生的PRES的CT和MRI病变部位具有一定特征性,结合病史可明确诊断.

Imaging findings of posterior reversible encephalopathy syndrome caused by pregnancy-induced hypertension

Objective To investigate the computer tomography (CT) and magnetic res-onance imaging (MRI) features of posterior reversible encephalopathy syndrome (PRES) caused by pregnancy-indueed hypertension (PIH). Methods CT scan and MRI scan + diffusion-weighted imaging (DWI) were used in 31 patients with PIH. Results CT scan found low density lesions in parietal-occipital lobe of watershed regions in 31 patients with PIH. CT value was 19 to 23Hu. Among them, MRI showed slight hypointensity lesions on T1-weighted images and slight hyperintensity lesions on T2-weight images in 11 patients, fluid-attenuated inversion recovery (FLAIR) sequence showed hyperintensity lesions, DWI revealed isointense, and apparent diffusion coefficient- did not decrease. The recovery time of clinical symptoms was earlier than that of MRI. Conclusions The lesion sites on cr and MRI had certain characteristics in PIH occurred PRES at late pregnancy, combining clinical history a clear diagnosis could be made.