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
大小和阻塞
，以选择
佳手术
。
第三人称单数）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大小和阻塞，以选择佳手术。
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