应用国产胶体硅酸钇（￣（９０）Ｙ）近距离照射脑肿瘤５６例，病例大多为开颅手术难以全切的深部及重要功能区的肿瘤、多发肿瘤。本组共注射￣（９０）Ｙ７２次。术后随访６～１５个月，临床症状改善者４１例（７３％），肿瘤显著缩小或消失者３８例（６８％），无严重副作用及并发症。作者讨论了￣（９０）Ｙ近距离照射脑肿瘤的治疗原则及手术体会。 56 cases of brain tumors were irradiated with domestic colloidal yttrium silicate (~ (90) Y). Most of the cases were tumors and multiple tumors in deep and important functional areas that were difficult to be cut by craniotomy. This group was injected ~ (90) Y72 times. The patients were followed up for 6-15 months. There were 41 cases (73%) with improvement of clinical symptoms, 38 cases (68%) with significant reduction or disappearance of tumor, and no serious side effects and complications. The authors discuss the treatment principle and surgical experience of ~ (90) Y brachytherapy in brachytherapy.