Type IIIb Endoleak: The Great "Masquerader" - Risks of Liquid Agent Dislocation During Sac Embolization Techniques.

The diagnosis of late type III endoleaks may be very challenging on non-invasive imaging studies, and it is not unusual for type IIIb endoleaks to be misdiagnosed as type I endoleaks. The present report illustrates a type III endoleak that was misdiagnosed and treated as Type Ia endoleak. Embolization of the endoleak using a liquid embolic agent (Squid) was complicated by intraluminal graft dislodgement of the liquid agent. This unusual complication was recognised and treated successfully. Type IIIb endoleaks should always be considered in patients with persistent aneurysm sac perfusion treated with embolization using liquid embolic agents.