Disclosed are methods for inhibiting the formation of potential endoleaks associated with endovascular repair of abdominal aortic aneurysms which comprise the in situ embolization of blood vessels associated with the aneurysmal sac prior to placement of an endovascular prostheses in the abdominal aorta. Embolization of the blood vessels is achieved by injection of either a biocompatible polymer or prepolymer fluid composition into these vessels in a sufficient amount such that upon in situ solidification of this composition, blood circulation through these blood vessels and the aneurysmal sac ceases.
