Endovascular embolization is a minimally invasive angiographic treatment method performed from within a blood vessel. The procedure typically begins through an artery in the groin; an introducer sheath is placed in this area, and all procedures are carried out via this thin sheath. Guided by angiography, specially developed delicate catheter, microcatheter, wire, and microwire systems are used to reach the diseased vessel area or lesion. Depending on the type of lesion, various intravascular materials are used to occlude this area. These may include very thin coils, embolizing particles of different structures and contents (occlusive microparticles), vascular glues, and filling materials (e.g., glue, Onyx). In specific cases such as liver tumors (hepatocellular carcinoma - HCC, metastases, etc.), specialized materials like microparticles impregnated with chemotherapy drugs or microspheres containing radioactive substances may be preferred. For the treatment of arterial aneurysms (vascular sacs) in the brain or other regions, balloon catheters or auxiliary stents (intravascular metallic cages) can be utilized as additional materials if needed. The closure of some aneurysms may also be possible using only special stents, such as flow-diverting stents or covered stents.