We report on the case of a 19-year-old man with post-traumatic high-flow priapism that appeared after riding on a mountain bike. Laboratory test (cavernous blood gas measurement) and image studies (color flow Doppler ultrasound and arteriography of the internal pudendal artery) that confirmed the diagnosis are depicted. He was successfully treated with selective percutaneous arterial embolization with autologous blood clot, recovering a normal erectile function.