Migrating tumor thrombus trapped within the greenfield filter of the inferior vena cava and depicted by FDG PET/CT.

A 72-year-old woman with leiomyosarcoma of the left thigh underwent a whole-body FDG PET/CT for staging, which demonstrated a large FDG-avid tumor in the left thigh and tumor thrombosis involving the profunda femoris artery/vein and superior femoral vein. A Greenfield filter was placed in the inferior vena cava before the radical resection of the tumor and thrombosis. Postoperative PET/CT showed an FDG-avid embolus trapped within the solid apical cap of the filter in the inferior vena cava. It was unknown if the tumor embolus migrated to the inferior vena cava before or during the surgical procedure of radical resection.