Stent-assisted coil embolization of wide-necked renal artery bifurcation aneurysms.

Objective: To report preliminary results of stent-assisted coil embolization in the treatment of wide-necked renal artery bifurcation aneurysms.

Methods: Four patients (three women, one man; mean age, 54 years; range, 49-67 y) with wide-necked renal artery aneurysms were treated with dedicated neurointerventional self-expanding nitinol stent-assisted coil embolization during a 2-year period. The stent was delivered over the neck of the aneurysm, after which the aneurysm was filled with detachable coils through a microcatheter placed into the aneurysm through the stent mesh.

Results: Stent delivery and coil embolization was successfully completed in all cases. Complete aneurysm occlusion without coil protrusion or arterial flow compromise was obtained in all patients. A small peripheral subsegmental renal infarction necessitating no therapy was registered in one patient on postembolization computed tomography. At follow-up angiography 1 year after embolization, no aneurysm recanalization or arterial obstruction was registered.

Conclusions: Our preliminary experience indicates that stent-assisted coil embolization is technically feasible and effective for the exclusion of challenging renal artery bifurcation aneurysms without the sacrifice of any branch arteries.