近十年来 ,用Ｘ(γ)刀治疗头部肿瘤迅猛增加 ,对于Ｘ(γ)刀在临床应用中出现的利弊 ,国内外已有不少学者进行了多方面的探讨。对头部肿瘤Ｘ(γ)刀治疗后复发患者的外放疗 ,由于风险大 ,经验少 ,目前还处于探索阶段。我院于 1998～ 2 0 0 0年共收治头部肿瘤 489例 ,其中属于外院 In the past decade, X (γ) knife has been used to treat head tumors rapidly. For the advantages and disadvantages of X (γ) knife in clinical application, many scholars at home and abroad have conducted many discussions. External radiotherapy for patients with recurrence after treatment of head tumor X(γ) knife is currently at an exploratory stage due to its high risk and little experience. In our hospital, from 1998 to 2000, a total of 489 head tumors were treated, which belonged to the external hospital.