肺血栓栓子的运行途径：从下肢静脉向上到达肺动脉主干及其分支，血栓栓子常来自下肢和盆腔的大静脉。
A pulmonary thromboembolus travels from a large vein in the leg up the inferior vena cava to the main pulmonary arteries as they branch. Such thrombi embolize most often from large veins in the legs and pelvis where thrombi form with stasis.