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本文观察分析了肝癌侵犯门静脉，在门脉分支及主干内形成癌栓后的ＣＴ影像特征。发现４６例中有４１例（９１％）有门脉增宽，此征象在ＣＴ图像上容易发现和测量出，可作为门脉癌栓的辅助诊断依据；同时ＣＴ平扫可以发现早期新形成的栓子，其特点是增宽的门脉内高密度结节影，ＣＴ值平均５６±７·８Ｈｕ；另外增强扫描可显示出平扫低密度而无增强表现的癌栓影。同时对上述各征象的产生机制进行了分析。
This article observes and analyzes the characteristics of CT images of liver cancer invading the portal vein and forming a tumor thrombus in the portal vein and trunk. It was found that 41 out of 46 patients (91%) had portal widening. This sign could be easily found and measured on CT images and could be used as an auxiliary diagnosis basis for portal vein tumor thrombus. Simultaneous CT scans can be used to detect newly formed early portal vein lesions. The embolus, which is characterized by a widened intraportal high-density nodules, has an average CT value of 56 ± 7·8 Hu; in addition, the enhanced scan can show a plain smear with low density without enhanced performance. At the same time, the mechanism of the above-mentioned signs was analyzed.