The best treatment for the malformation seems to be embolization rather than surgery.
In embolization the surgeons thread a small catheter, or tube, into an artery (femoral) up to the site of the malformation. With the catheter in place, the doctors insert a substance that blocks the blood flow through the malformation and forms a clot that closes it off.
The embolization treatment may require several procedures to gradually close off the blood flow. However, when it is completed successfully, patients usually do very well.