Embolization of a renal artery aneurysm using ethylene vinyl alcohol copolymer (Onyx).

Purpose: To report the embolization of a renal artery aneurysm using Onyx, a radiopaque nonadhesive liquid embolic agent.

Case Report: A 28-year-old woman with hypertension and fibromuscular dysplasia presented with a 20-mm renal artery aneurysm. In order to avoid any migration of embolic material into the parent vessel, a compliant balloon was inflated to exclude the aneurysm from the blood flow while injecting the liquid embolic agent. Complete aneurysm exclusion was achieved immediately, with no angiographic or duplex evidence of distal embolization or intra-aneurysmal flow. The Doppler ultrasound at 6 months confirmed aneurysm exclusion.

Conclusions: The ease of use and nature of this material makes Onyx an effective and safe option in the treatment of wide-necked renal aneurysms.