急淋患儿中枢神经系(CNS)复发高危者,预防性照射CNS后可大大提高无瘤生存率。但CNS预防性照射24Gy后多年可出现智力受损,因而已将全脑总剂量减为18Gy。这样,是否多年后也会出现智力受损、文献报道不一。为研究这点,1971～1984年间作者作了前瞻性研究。此期间,作者共全 Acute lymphoid children with central nervous system (CNS) high risk of relapse, prophylactic radiation CNS can greatly improve the tumor-free survival rate. However, CNS after 24Gy prophylaxis may occur for many years after intellectual impairment, so the total brain dose has been reduced to 18Gy. In this way, whether there will be intellectual damage after many years, the literature reported different. To study this point, the author made a prospective study from 1971 to 1984. During this period, the author altogether