A youth of sixteen, who had had motor disturbances since the age of three, attributed to organic brain lesion, complicated by neurosis, was analysed with resolution of the symptoms. The relationship between an infantile repression of masturbation and the development of motor disturbances (muscular erotism) is demonstrated. The patient's dyskinetic symptoms present a variant of the four forms of the unconscious representation of the body as a phallus described by Bertram Lewin.