Diagnostic arteriography with a 4 Fr hydrophilic catheter was performed for both internal iliac arteries and superselective arteriography of the left internal pudendal and left common penile artery with a high-flow microcatheter. There are several tiny distal branches of the left common penile artery supplying the arterio-cavernous fistula causing the high-flow priapism. Embolization was performed with gelatin sponge pledgets injected through the microcatheter.