先天性泪囊瘘管系先天发育异常,瘘管从泪囊直接开口于鼻腔者为内侧瘘,临床不易发现,常见者为外侧瘘,外侧开口可以位于睑缘、眼睑皮肤面、结膜或泪阜上,眼睑皮肤开口多位于鼻外侧下睑或内眦韧带处,内侧端可汇入泪小管、进入泪总管或泪囊,也可以终止于一个囊状盲端而与泪道无关。因外侧开口较小,不易察觉常会漏诊或误诊为泪道堵塞或泪囊炎。常流出清液,有的合并感染则有脓性分泌物。我 Congenital lacrimal sac fistula congenital dysplasia, fistula directly from the lacrimal sac opening in the nasal cavity for the medial fistula, clinical difficult to find, the common external fistula, the lateral opening can be located in the eyelid, eyelid skin, conjunctiva or tear Fu on, Eyelid skin openings are located in the lateral nasal lower eyelid or ligament, the medial end of the canal into the canaliculi, into the tear duct or lacrimal sac, can also terminate in a sac-like blind and lacrimal duct has nothing to do. Due to the small lateral opening, not easy to detect often missed or misdiagnosed as lacrimal duct obstruction or dacryocystitis. Often out of the supernatant, and some infections have purulent secretions. I