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American Journal of Roentgenology, Vol 147, Issue 3, 587-592
Copyright © 1986 by American Roentgen Ray Society

Articles

CT evaluation of effects of cranial radiation therapy in children

PC Davis, JC Hoffman Jr, GS Pearl, and IF Braun

A retrospective evaluation was completed of 49 children who received conventional cranial radiation therapy for primary central nervous system and/or skull-base neoplasia and who had follow-up CT studies. In these children, abnormalities in normal parenchyma away from the tumor itself were surprisingly frequent, with or without chemotherapy. Generalized volume loss or atrophy was the most frequent abnormality (51%), but in this population it may have resulted from a variety of causes. Calcification in nontumorous parenchyma was common (28%) with or without chemotherapy. The most frequent site of calcification was subcortical at the gray-white junction. Calcification was progressive over 1-2 years and correlated pathologically with mineralizing microangiopathy and dystrophic calcification with demyelination. White-matter abnormalities other than those associated with shunt malfunction and tumor edema occurred in 26% of the patients. Both white-matter abnormalities and calcification occurred predominantly in younger children, particularly those under 3 years old at the time of radiation therapy. Of the 21 children who received chemotherapy in this series, only two received methotrexate. White-matter abnormalities and calcifications occurred with similar frequency in children with and without chemotherapy; thus, radiation therapy is the most likely cause of these findings.
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