“…Furthermore, there are also cases in which anticoagulant treatment fails and the DVT progresses to proximal veins or to PE despite adequate levels of anticoagulation 9 . In such cases, placement of an inferior vena cava filter (iVCF) is recommended [10][11][12][13][14] . Insertion of an iVCF is indicated for around 8% of patients with lower limb DVTs and the procedure is considered safe and effective 11,14,15 .…”