The author gives a definition of sexual abuse on minors, emphasizing its more frequent occurrence inside the family (incest) than outside. He describes the countertransference reactions induced by this type of abuse, especially in professional teams who tend to put each other in a position of rivalry. Next, he sketches the pathogeny of sexual abuse, the clinical signs and the long term effects. The author deduces what should be the first signs of sexual abuse and proposes a pattern of diagnosis. Finally, he explains a management model, of the crisis and the follow-up of this difficult situation.