Inferior Vena Cava Filter Thrombus: a Possible Cause of an Unanticipated Finding of (99m)Tc-labeled Red Blood Cell Scintigraphy.

(99m)Tc-labeled red blood cell scintigraphy, a sensitive and specific diagnostic test, is useful for patients suspected of suffering from active gastrointestinal bleeding. This study follows a case of a patient who was suspected of gastrointestinal bleeding after an inferior vena cava filter was inserted due to a deep vein thrombosis of the femoral vein. To evaluate an exact focus of bleeding, (99m)Tc-labeled red blood cell scintigraphy was executed. Herein, an unanticipated finding of (99m)Tc-labeled red blood cell scintigraphy probably due to a thrombus on the inferior vena cava filter is reported.