[Unusual CT skull findings after preventive CNS treatment of acute leukemia in children].

CT examinations of the cranium were carried out among 15 children who had previously received cranial radiation and i.th. methotrexate during leukemia management. Surprisingly, 10 of 15 patients had abnormal CT findings. Only 2 of the 10 "CT-positive" children were clinically-neurologically conspicuous. The visible CT alterations of brain structure seemed especially marked and frequent the more time had elapsed since CNS-treatment. The most striking CT pathologica were found among children up to 5 years of age, who were also conspicuous through convulsions and delayed development.