lacrimal

• Conclusion ： digital subtraction dacryocystography is a rapid ， effective and noninvasive imaging technique ， and it is helpful in the diagnosis ， treatment and study of lacrimal duct obstruction
  结论：数字减影泪道造影术是一种快速、有效和无损伤的检查方法，在泪道阻塞的诊断和治疗中将起重要作用。