Fig. 1

The filter retrieval in case 1. (A) The initial inspection of the filter demonstrated that one strut had been inverted due to the previous attempt to retrieve the filter (arrow). (B) Multiplanar venography confirmed filter embedding of the tip and upper side (arrow). (C) A pigtail catheter was used to hook under the apex of the filter, while a 0.035-inch, 260 cm length guide wire was passed through the catheter and retrieved using a snare from the sheath. (D) The filter was inverted, and certain struts were displaced within the sheath (arrow). (E) The venography conducted from the femoral vein revealed that the tip was still embedded. (F) By applying a pulling force from the wire loop (black arrow) and a pushing force from the forceps (white arrow) at the same time, the filter’s tip was straightened and aligned with the sheath. (G) The final venography showed no perforation in the IVC, but there was still residual thrombosis in the right iliac vein and IVC