[Erection due to 'high flow' priapism in a 5-year old: an emergency].

A healthy 5-year-old child was brought to the general practitioner with priapism that had been observed for a few days, without any other symptoms. Angiography revealed an arteriovenous fistula originating from the left A. dorsalis penis, which was successfully embolised. The diagnosis was 'high flow' priapism. A possible cause in the anamnesis was a fall from a swing two weeks before the embolisation. The doctor's delay was caused by unfamiliarity with this rare disorder; due to the risk of impotence (impotentia coeundi), it is an emergency situation.