摘要目的 探讨3D动态增强MRA(3D DCE MRA)诊断食管胃静脉曲张的临床价值.方法 回顾性分析2003年4月至2008年6月期间本院同时行3D DCE MRA和内镜检查的153例门静脉高压患者,将所有患者分为出血组和无出血组,对3D DCE MRA图像进行减影后处理,采用MIP和薄层(thin-MIP)方法3D重组,测量3D DCE MRA图像中食管壁内和壁外曲张静脉、胃黏膜下和胃周曲张静脉的最小、最大以及平均直径,对照内镜结果,采用Spearman秩相关分析研究3D DCE MRA与内镜结果的相关性,并采用X~2检验比较出血组和无出血组食管壁外及胃周曲张静脉的出现率.结果 出血组食管静脉重度曲张59例,中度曲张6例,轻度曲张5例,无出血组食管静脉重度曲张32例,中度曲张4例,轻度曲张5例;出血组胃静脉重度曲张28例,中度曲张34例,轻度曲张16例,无出血组胃静脉重度曲张7例,中度曲张12例,轻度曲张9例.减影后的MIP图像能够总体显示食管胃曲张静脉,thin-MIP重组图像能够鉴别食管壁内和壁外曲张静脉以及胃黏膜下和胃周曲张静脉.3D DCE MRA测得食管胃曲张静脉的直径与内镜分级呈相关性,r值为0.544～0.878(P＜0.01).食管静脉重度曲张组91例,在出血组(59例)和无出血组(32例)出现食管壁外静脉分别为27例(27/59)和24例(24/32),差异有统计学意义(X~2=7.199,P＜0.01);胃静脉重度曲张组35例,在出血组(28例)和无出血组(7例)出现胃周静脉的分别为22例(22/28)和4例(4/7),差异无统计学意义(P=0.340).结论 3D DCE MRA可全面显示食管胃曲张静脉,对食管和胃静脉曲张的评价与内镜结果呈正相关,食管壁外静脉的出现可能降低重度食管静脉曲张破裂出血的危险性.

abstractsObjective To investigate the clinical value of three dimensional dynamic contrast enhanced MRA(3D DCE MRA)on esophageal and gastric varices compared with endoscopy.Methods From April 2003 to June 2008,153 patients with portal hypertension who underwent both 3D DCE MRA and endoscopy were reviewed retrospectively.All the patients were divided into bleeding group and non-bleeding group according to the clinical symptoms.The location and degree of the esophagogastric varices on 3D DCE MRA were assessed with postprocessing images,including subtraction,MIP and thin-slab maximum intensity projection(thin-MIP),and were compared with the results of endoscopy.The maximum,minimum and mean diameters of esophagogastric varices inside and outside of the wall were measured on the reformed images.The correlation between the findings of 3D DCE MRA and endoscopy were analyzed with Spearman rank correlation coefficient test The rates of esophagogastric varices outside of the wall in bleeding and non-bleeding group were compared by means of Chi-square test Results In bleeding group,severe esophageal varices were documented in 59 patients,moderate in 6 patients,mild in 5 patients;in non-bleeding group,severe esophageal varices were documented in 32 patients,moderate in 4 patients,mild in 5 patients.Severe,moderate,and mild gastric varices were documented in 28,34 and 16 in bleeding group,while they were 7,12 and 9 in non-bleeding group.Esophageal and gastric varices can be wholly presented on MIP images after subtraction,while the esophagogastric varices inside and outside of the wall can be differentiated on thin-MIP images.The location and degree of esophagogastric varices on 3D DCE MRA were correlated with the findings of the endoscopy.The range of r was from 0.544 to 0.878(P＜0.01).In 91 patients with severe esophageal varices,27 patients presented outside esophageal varices in bleeding group(n=59)and 24 patients presented outside esophageal varices in non-bleeding group(n=32).There was a significant difference in ratio of outside esophageal varices between bleeding group and nonbleeding group(X~2=7.199,P＜0.01).In 35 patients with severe gastric varices,22 patients showed adventitial gastric varices in bleeding group(n=28)and 4 patients showed adventitial gastric varices in non-bleeding group(n=7).The ratio of adventitial gastric varices in bleeding group was not significantly different from that of non-bleeding group(P=0.340).Conclusions 3D DCE MRA can display and differentiate the esophagogastric varices both inside and outside of the wall by three dimensional reconstruction.The results of 3D DCE MRA and endoscopy have good correlation.It is of importance in evaluating the esophageal varices outside of the wall,because they may indicate decreased risk of haemorrhage in patients with severe degree of esophageal varices.