Abstract
Incomplete filter opening, causing filter migration and inferior vena cava (IVC) perforation, have often been observed with the Greenfield-type IVC filter, but reports of incomplete opening of the ALN-type IVC filter are extremely rare. We present herein the case of incomplete opening of an ALN-type IVC filter due to entanglement of the filter legs, which caused filter migration, IVC wall perforation, and penetration into the kidney and iliopsoas muscle. Successful percutaneous retrieval was performed without complications. Our experience provides guidance for similar situations in the future, including the need to check for complete filter opening.
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