Objective To investigate the effect of endoscopic sinus surgery (ESS) and endoscopic endonasal dacryocystorhinostomy on the nasolacrimal duct and lacrimal sac fossa.

• 摘要目的：探讨内窥镜鼻窦手术和经鼻泪囊手术对泪囊和鼻泪管的形响。