Fig. 1

Patient with a typical case of chronic liver cirrhosis who developed a left-sided iliofemoral thrombosis. a An OptEase filter (black arrow) was placed in the inferior vena cava (IVC). b, c Follow-up computed tomography (CT) of the IVC performed 14 days after filter placement revealed a “filling defect” in and below the filter (black arrowhead), indicating extensive intra-filter and IVC thrombosis. The thickened IVC wall (black arrow) appeared as a ring around the thrombus (c). d–f The last CT imaging of the IVC was performed 14 months after filter placement. d An intra-filter thrombus (black arrowhead). The protruded struts of the filter (black arrow) indicate grade 2 protrusion. Large amount of ascites (black asterisk) was also present. e, f The IVC below the filter shows as an “atrophic” strip (black arrow)