Abstract: Objectiv The aim of this study was to investigate the predictive value of preoperative CT/MRI indicators for portal vein thrombosis（PVT） in patients with liver cirrhosis after splenectomy. Methods 87 patients with hepatitis B liver cirrhosis after splenectomy were retrospectively analyzed in our hospital between July 2016 and July 2018,and all patients were followed-up and underwent CT and MRI check-up. Multivariate logistic regression analysis was applied to predict the independent influencing factors of PVT formation after splenectomy. Results At the end of three-month follow-up,46 patients （52.9%） had PVT out of the 87 patients with cirrhosis,belonging to typeⅠPVT,and mural thrombus was found in 45 patients（51.7%）,out of which,14（16.1%） as mural thrombus in superior mesenteric vein;the diameter of portal vain in 46 patients with PVT was（16.7±2.2）mm,significantly wider than 【（14.8±1.5） mm,P<0.05】 in 41 patients without PVT,the difference of portal vein velocity was （8.4±5.5） cm/s, significantly rapider than [（6.1±3.6） cm/s,P<0.05] in non-PVT group and the spleen volume was （1370.8±370.1） cm³,significantly larger than [（1205.2±357.3） cm³,P<0.05] in non-PVT group;multivariate logistic regression analysis showed that the diameter of portal vein（OR=0.869,95%CI=0.608-1.246）,the velocity difference of portal vein（OR=1.185,95%CI=1.079-1.317）,and the spleen volume（OR=3.427,95%CI=2.215-5.302） were the independent influencing factors of PVT formation after splenectomy in patients with cirrhosis （P<0.05）. Conclusion Preoperative CT/MRI diagnostic indexes such as portal vein diameter,portal vein velocity difference and spleen volume are independent influencing factors of PVT formation after splenectomy for liver cirrhosis.

Key words: Liver cirrhosis, Splenectomy, Portal vein thrombosis, CT, MRI