AIM:To study the application of computed tomographic dacryocystography and three-dimensional reconstruction in endoscopic transnasal dacryocystorhinostomy.

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.