[The neuroevolutionary profile of the nursing infant with macrocephaly and benign enlargement of the subarachnoid space].

With the purpose of studying the neuroevolutionary prognosis of children with macrocephaly (percentile 95) and the widening of the subarachnoid space, identified using head CAT scans-five cases were selected from the Pediatric-Neurology Department from the Teaching Regional Hospital of Trujillo-Perú, seen during January 1983 and January 1988 with a follow-up of 1 and 1/2 and 3 years. All of the children showed an abnormal separation of the frontal subarachnoid space, interhemispheric fissure and Silvio incision without ventriculomegaly o a minimal dilation of the ventricular system. Through neurological evaluation and the Denver Development Test, in all cases except one, a characteristic pattern of hypotony and gross motor retardation were seen during the first year of life, which was modified towards normality during the following months until the age of 24 to 40 months. This findings suggest the good prognosis and benign nature of this condition which can be spontaneously resolved and apparently related to benign family macrocephaly.