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目的：探讨伽玛刀治疗听神经瘤后的影像学表现。方法：回顾研究５８例行伽玛刀治疗后随访时间在１２～２６个月（中位数１８个月）的听神经瘤病人。结果：伽玛刀术后肿瘤内坏死无强化率为６２．５％，其中１６．１％复强化。术后脑积水的发生率为１４．３％，肿瘤平均直径＜２ｃｍ患者中无一发生术后脑积水。桥脑或／或小脑水肿的发生率为５．２％。卡方检验示术前肿瘤平均直径与术后脑积水有统计学意义（Ｐ＜０．０１），部分患者术后发生脑积水和／或肿瘤内坏死，两者经卡方检验有统计学意义（Ｐ＝０．０１）。结论：肿瘤内坏死无强化为术后特征性的影像学表现，术后并发症在影像上表现为脑积水及桥脑和／或小脑水肿。术后脑积水的发生率随术前肿瘤平均直径增大而升高，术后脑积水的发生可能与肿瘤内坏死有关
Objective: To investigate the imaging features of gamma knife after acoustic neuroma treatment. Methods: Retrospectively studied 58 patients with acoustic neuromas who were followed up for 12 to 26 months (median 18 months) after gamma knife treatment. Results: The necrosis-free necrosis rate after gamma knife surgery was 62.5%, of which 16.1% was re-intensified. The incidence of postoperative hydrocephalus was 14.3%, and none of the patients with an average tumor diameter less than 2 cm had postoperative hydrocephalus. The incidence of pons or/and cerebellar edema was 5.2%. The chi-square test showed that the average diameter of the tumor before operation and hydrocephalus after operation were statistically significant (P<0.01). Some patients had postoperative hydrocephalus and/or necrosis in the tumor. There were statistics by Chi-square test. Significance (P=0.01). CONCLUSIONS: The absence of tumor necrosis is a characteristic imaging feature postoperatively. Postoperative complications are hydrocephalus and pons and/or cerebellar edema. The incidence of postoperative hydrocephalus increases with the average diameter of the preoperative tumor. Postoperative hydrocephalus may be related to necrosis in the tumor.