Sixty-four infants and children under 14 years of age had a neuro-sedation, for a cranial C.-T. Scan. This entirely painless procedure requires complete immobility of the patient. We used two sorts of methods: for infants under eight months of age, a premedication followed by a feeding-bottle is sufficient. For children over eight months of age, intravenous administration of gamma-hydroxy-butyrate at 30 to 50 mg/kg induces light but sufficient sleep in obtaining a useful scan. Within the group of 24 infants we obtained 14 good results, 8 mild ones and 2 failures. Within the 40 children over eight months of age, 28 procedures were good, 10 children had to undergo more anesthesia during the examination and twice the exploration was impossible.