Objective: To treat large mandibular cystic lesions by fenestration decompression and to explore its clinical value in mandibular functional surgery. Methods:34 large mandibular cystic lesions cases treated by fenestration decom-pression were reviewed. All cases were followed-up at least 12 months. According to the clinical observation, and radio-logical examination,the clinical cure rate was evaluated. Results: 34 cases were followed-up for 1~9 years. The cystic cavity of 11 cases almost regressed completely, and thus didn't need a two-stage treatment. However, the cystic cavity of another 23 cases reduced significantly and were treated by two-stage curettage. The bone morphology and function re-sumed well and no reoccurrence was identified. Conclusion:The treatment of larger mandibular cystic lesions by decom-pression was effective to save the morphology and function of mandible.%目的：通过开窗减压术治疗下颌骨大型囊性病变，探讨其在下颌骨功能性外科中的应用价值。方法：34例下颌骨大型囊性病变患者采用开窗减压术治疗，术后随访12个月以上，通过临床和影像学检查评价治疗效果。结果：34例病例术后随访1～9年。11例囊腔基本完全消退未进行二期处理，23例囊腔显著缩小行二期刮治手术。所有病例形态功能恢复良好无复发。结论：开窗减压术治疗下颌骨大型囊性病变，是保存下颌骨形态及功能的有效方法。
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