A case of a scalp arteriovenous fistula associated with Rendu-Osler-Weber disease treated by direct percutaneous embolization
We present a case of Rendu-Osler-Weber disease (hereditary hemorrhagic telangiectasia) accompanied by a scalp arteriovenous fistula, which was successfully treated by direct percutaneous embolization. A 51-year-old man, who had multiple vascular telangiectases and pulmonary arteriovenous fistulae, developed an enlarging pulsatile mass of the scalp anterior to the site of the previous craniotomy for a brain abscess in the right occipital lobe. Angiography demonstrated a high-flow arteriovenous fistula between the right superficial temporal artery and a varix. Percutaneous injection of pure ethyl alcohol was planned but seemed risky because of the major drainage being into the bilateral cavernous sinuses through the superior ophthalmic veins. A 24-gauge plastic needle was placed in the right superficial temporal artery just proximal to the fistula, and 0.7 ml of a mixture consisting of n-butyl cyanoacrylate and lipiodol in a ratio of 1:1 was injected. Then, the varix was directly punctured, and retention of the contrast medium was confirmed under manual compression by the placement of a circular ring. Embolization of the varix using 1.0 ml of 70% glucose solution and a subsequent 1.0 ml of pure ethyl alcohol was performed with compression, resulting in total occlusion of the fistula. The scalp mass resolved gradually and there was no evidence of recanalization. We conclude that direct percutaneous embolization is the first therapeutic choice for a scalp arteriovenous fistula with multiple shuntings associated with Rendu-Osler-Weber disease. Dangerous venous drainage should be eliminated before performing embolization with ethyl alcohol.