Dacryocystography was preformed in all patients before operation to confirm the obstructive sity and the size of lacrimal sac.
术前造影以了解泪囊的大小和阻塞的部位，以选择
佳手术适应证。
Dacryocystography was preformed in all patients before operation to confirm the obstructive sity and the size of lacrimal sac.
术前造影以了解泪囊的大小和阻塞的部位，以选择佳手术适应证。
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