CAT scan is now the primary diagnostic procedure for intracranial lesions in children. It is particularly well-suited for investigating intracranial hypertension, tumors and other space-occupying lesions, hydrocephalus, and malformations. Because it is non-invasive, this technique tends to be unduly performed as a screening procedure, with a resulting oversaturation of neuroradiological facilities. CAT scan should not be used as a routine examination, but only in well-selected cases. Careful clinical assessment and a good knowledge of pediatric neurology are still essential. New techniques are now becoming available and neuroradiologists will be able to select the best investigation for each particular case.