Stent grafting for aortic aneurysms is becoming more prevalent, but post-treatment endoleaks, particularly in EVAR, pose a durability issue and have recently garnered significant attention. The treatment options for endoleaks range from open surgical repair (OSR) to embolization, although the majority of endoleaks suitable for embolization are type 2 endoleaks. There are two primary approaches to embolization: transarterial and direct percutaneous puncture, each with its own advantages and disadvantages. This paper presents the embolization technique using NBCA and introduces actual cases based on the aforementioned characteristics.