方法：对46例65眼鼻内镜下泪囊鼻腔造孔术患者术前进行泪囊CT造影及三维重建，从而对泪囊及开口处进行准确定位，指导手术操作。观察其疗效。

结果：所有手术均顺利完成，术中按照术前定位点均较顺利找到泪囊。有效率100%。

结论：泪囊CT造影及三维重建可成为鼻内窥镜下泪囊鼻腔造孔术前的一项常规检查。

METHODS: Forty-six cases 65 eyes were performed computed tomographic dacryocystography and three-dimensional reconstruction before the endoscopic transnasal dacryocystorhinostomy in order to locate the opening of lacrimal sac accurately and guide the operation. The curative effect was observed.

RESULTS: All operations were successfully performed with the accurate location of lacrimal sac before the operation and the operation efficiency was 100%.

CONCLUSION: Computed tomographic dacryocysto-graphy and three-dimensional reconstruction should be a routine examination before endoscopic transnasal dacryocystorhinostomy.